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Old May 16th, 2014, 04:50 PM
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Default Re: GATE Life Sciences Previous 5 year Papers

Here I am giving you question paper for GATE Life Sciences examination

Some questions are given below :
General Aptitude (GA) Questions (Compulsory)
Q. 1 – Q. 5 carry one mark each.
Q.1 If (1.001)1259 = 3.52 and (1.001)2062 = 7.85, then (1.001)3321 =
(A) 2.23 (B) 4.33 (C) 11.37 (D) 27.64
Q.2 One of the parts (A, B, C, D) in the sentence given below contains an ERROR. Which one of the
following is INCORRECT?
I requested that he should be given the driving test today instead of tomorrow.
(A) requested that
(B) should be given
(C) the driving test
(D) instead of tomorrow
Q.3 Which one of the following options is the closest in meaning to the word given below?
(A) Eligibility (B) Freedom (C) Coercion (D) Meticulousness
Q.4 Choose the most appropriate word from the options given below to complete the following
Given the seriousness of the situation that he had to face, his ___ was impressive.
(A) beggary (B) nomenclature (C) jealousy (D) nonchalance
Q.5 Choose the most appropriate alternative from the options given below to complete the following
If the tired soldier wanted to lie down, he ___ the mattress out on the balcony.
(A) should take
(B) shall take
(C) should have taken
(D) will have taken
Q. 6 - Q. 10 carry two marks each.
Q.6 One of the legacies of the Roman legions was discipline. In the legions, military law prevailed
and discipline was brutal. Discipline on the battlefield kept units obedient, intact and fighting,
even when the odds and conditions were against them.
Which one of the following statements best sums up the meaning of the above passage?
(A) Thorough regimentation was the main reason for the efficiency of the Roman legions even in
adverse circumstances.
(B) The legions were treated inhumanly as if the men were animals.
(C) Discipline was the armies’ inheritance from their seniors.
(D) The harsh discipline to which the legions were subjected to led to the odds and conditions being
against them.

Q.7 A and B are friends. They decide to meet between 1 PM and 2 PM on a given day. There is a
condition that whoever arrives first will not wait for the other for more than 15 minutes. The
probability that they will meet on that day is
(A) 1/4 (B) 1/16 (C) 7/16 (D) 9/16
Q.8 The data given in the following table summarizes the monthly budget of an average household.
Category Amount (Rs.)
Food 4000
Clothing 1200
Rent 2000
Savings 1500
Other expenses 1800
The approximate percentage of the monthly budget NOT spent on savings is
(A) 10% (B) 14% (C) 81% (D) 86%
Q.9 There are eight bags of rice looking alike, seven of which have equal weight and one is slightly
heavier. The weighing balance is of unlimited capacity. Using this balance, the minimum number
of weighings required to identify the heavier bag is
(A) 2 (B) 3 (C) 4 (D) 8
Q.10 Raju has 14 currency notes in his pocket consisting of only Rs. 20 notes and Rs. 10 notes. The total
money value of the notes is Rs. 230. The number of Rs. 10 notes that Raju has is
(A) 5 (B) 6 (C) 9 (D) 10

H : CHEMISTRY (Compulsory)
Q. 1 – Q. 5 carry one mark each.
Q.1 Among the following, the most reactive diene in the Diels-Alder reaction is
Q.2 The molecule that does NOT absorb the microwave radiation is
(A) CO2 (B) H2O
(C) CO (D) NO
Q.3 The hybridization of atomic orbitals of sulphur in SF4 is
(A) dsp2 (B) sp3d2
(C) sp3d (D) sp3
Q.4 The ionic size of Na
, F
, Mg
and Al
varies as
(A) Al
3+ > Mg
> Na
+ > F
(B) F
- > Na
+ > Mg
> Al
(C) Al
3+ > Mg
> F
> Na
(D) Na
+ > F
> Mg
2+ > Al
Q.5 The non-aromatic compound/ion is

Q. 6 - Q. 15 carry two marks each.
Q.6 As predicted by MO theory, the bond order and magnetic nature of NO
(A) three and paramagnetic (B) two and diamagnetic
(C) two and paramagnetic (D) three and diamagnetic
Q.7 The value of ionic product of water changes with temperature. It is 1 10
at 25 oC and 1 10
at 60 C. The CORRECT statement with respect to H and S is
(A) H is negative and S is negative (B) H is positive and S is zero
(C) H is positive and S is negative (D) H is negative and S is positive
Q.8 10 micrograms of the enzyme carbonic anhydrase (molecular weight = 30,000 g/mole) removes
300 milligrams of carbon dioxide per minute from the cells. The turnover number of the enzyme is
(A) 20 min–1 (B) 2 107 min–1
(C) 2 1010 min–1 (D) 7.2 1010 min–1
Q.9 The iodide which reacts most slowly with cyanide ion as a nucleophile in a SN
2 reaction is
Q.10 The value of Ka of acetic acid is 1.7 10–5 mol/dm3. The pH of a buffer solution prepared by
mixing 100 ml of 0.1 M acetic acid with a solution of 100 ml of 0.2 M sodium acetate is
(A) 4.1 (B) 4.5
(C) 5.1 (D) 5.5
Q.11 The value of standard half cell potential of Cu+2, Cu couple (E0
Cu(+2), Cu) is 0.34 V. A wire of pure
copper is immersed into a solution of copper nitrate. If the measured cell potential against standard
hydrogen electrode at 298 K is 0.24 V, the molar concentration of copper nitrate is
{Assume activity of Cu+2 = [Cu+2]}.
(A) 4.1 10–4 M (B) 2.0 10–2 M
(C) 3.4 10–2 M (D) 1.8 10–1 M
2012 XL
XL 6/28
Common Data Questions
Common Data for Questions 12 and 13:
[FeCl4]2– (I), [CoCl4]2– (II) and [NiCl4]2– (III) are paramagnetic tetrahedral complexes.
Q.12 The order of values of crystal field stabilization energy is
(A) I > III > II (B) III > I > II
(C) I > II > III (D) II > III > I
Q.13 The order of values of spin only magnetic moment is
(A) III > II > I (B) III > I > II
(C) II > I > III (D) I > II > III
Linked Answer Questions
Statement for Linked Answer Questions 14 and 15:
Bromine water is decolourised upon reaction with (E)-3-hexene.
Q.14 It is due to
(A) electrophilic addition of bromine to C=C (B) nucleophilic addition of bromine to C=C
(C) electrophilic allylic bromination (D) nucleophilic allylic bromination
Q.15 The structure of the product obtained is
Br Br

Q. 1 – Q. 10 carry one mark each.
Q.1 Four proteins (P1, P2, P3 and P4) have 17, 10, 21 and 14 percent hydrophobic amino-acids
respectively. The order of precipitation of these proteins using ammonium sulphate will be
(A) P3, P1, P4, P2 (B) P3, P1, P2, P4 (C) P2, P4, P3, P1 (D) P2, P4, P1, P3
Q.2 Which one of the following pairs of amino-acids in the protein has high propensity to take up the
α-helix conformation?
(A) Gly-Asp (B) Pro-His (C) Gly-Pro (D) Ala-Arg
Q.3 Which one of the following closely defines ‘Molten Globule’ state of a protein?
(A) State with high degree of secondary structure and loss of tertiary structure
(B) State with complete loss of secondary structure
(C) Completely unfolded state
(D) Loss of quaternary structure
Q.4 Which one of the following amino-acids has highest fluorescence quantum yield () in aqueous
(A) Tyrosine (B) Tryptophan (C) Phenylalanine (D) Histidine
Q.5 Which one of the following compounds does NOT block electron transport?
(A) Cyanide (B) Rotenone (C) Oligomycin (D) Antimycin A
Q.6 The pair of amino-acids which does NOT undergo post-translational modification is
(A) Asn-His (B) Tyr-Ser (C) Asn-Ser (D) Ala-Gly
Q.7 Match the hormones in Group I with their metabolic precursor in Group II
Group I Group II
P. 17-estradiol 1. Arachidonic acid
Q. Thromboxane A2 2. Tyrosine
R. Epinephrine 3. -carotene
S. Retinoic acid 4. Cholesterol
(A) P-4, Q-2, R-3, S-1 (B) P-1, Q-3, R-2, S-4
(C) P-4, Q-1, R-2, S-3 (D) P-1, Q-2, R-4, S-3
Q.8 Upon stimulation of a eukaryotic cell, the intracellular calcium (Ca2+) is released from
(A) Endoplasmic reticulum (B) Nucleus
(C) Peroxisome (D) Mitochondria
Q.9 Leguminous plants maintain a very low concentration of free oxygen in their root nodules because
(A) the nitrogen fixing bacteria living in the root nodules are anaerobic
(B) of binding of oxygen to leghemoglobin
(C) reductase enzyme of the nitrogenase complex helps in removal of O2
(D) nitrogenase enzyme of the nitrogenase complex helps in removal of O2

Q.10 The membrane of mature B cells have
(A) both IgG and IgM (B) both IgG and IgD
(C) both IgM and IgE (D) both IgM and IgD
Q. 11 - Q. 20 carry two marks each.
Q.11 An amino-acid has one proton donating group in the side chain (R). The pKCOOH, pKNH2 and pKR
values for this amino-acid are 2.19, 9.67 and 4.25, respectively. Which one of the following
statements about this amino-acid is CORRECT?
(A) Majority of the molecules will have a net charge of -1 at pH of 7.0
(B) Majority of the molecules will have a net charge of 0 at pH of 4.25
(C) All the molecules will have a deprotonated R group at pH of 3.22
(D) During titration with a strong base, deprotonation will start with the R group
Q.12 Which one of the following bacterial toxins does NOT have ADP-ribosyl transferase activity?
(A) Pertussis toxin (B) Diphtheria toxin
(C) Pseudomonas Exotoxin A (D) S. aureus α-toxin
Q.13 The CORRECT pair of amino-acid sequence and the corresponding target organelle is
(A) KDEL - Golgi (B) K-K/R-X-K/R - Lysosome
(C) SKL - Peroxisome (D) NPVY - Endoplasmic reticulum
Q.14 -oxidation of a 16 carbon fatty acid and a 17 carbon fatty acid leads to formation of
(A) (8 Acetyl CoA) and (8 Acetyl CoA + CO2), respectively
(B) (5 Propionyl CoA + 1 CO2) and (5 Propionyl CoA +1 Acetyl CoA), respectively
(C) (5 Propionyl CoA + 1 CO2) and (5 Propionyl CoA + 2 CO2), respectively
(D) (8 Acetyl CoA) and (7 Acetyl CoA + 1 Propionyl CoA), respectively
Q.15 Pick the correctly matched pairs.
P. Immature B cells — Terminal deoxynucleotidyl transferase
Q. Activated B cells — Class switching
R. Pre B cells — Surrogate light chain
S. Mature B cells — Recombination activating gene 1
(A) P and R (B) Q and R
(C) Q and S (D) Q and P
Q.16 The actual free energy change of a given biochemical reaction carried out under standard
conditions with 1 M initial concentration of each of the reactants and products will be
(A) equal to zero
(B) equal to standard free energy change for the reaction
(C) less than the standard free energy change for the reaction
(D) greater than the standard free energy change for the reaction

Q.17 Match the enzymes in Group I with their corresponding activity in Group II
Group I Group II
P. Flippase 1. Catalyzes the movement of any phospholipid across the lipid bilayer
down its concentration gradient
Q. Floppase 2. Catalyzes the translocation of amino-phospholipids from the
extracellular to the inner leaflet
R. Lipase 3. Catalyzes the translocation of membrane phospholipids from cytosolic to
the extracellular leaflet
S. Scramblase 4. Degradation of phospholipids from the lipid bilayer including the inner
and outer leaflets
(A) P-2, Q-3, R-4, S-1 (B) P-1, Q-2, R-3, S-4
(C) P-4, Q-1, R-2, S-3 (D) P-3, Q-2, R-4, S-1
Q.18 Match the antibiotics in Group I with their mechanism of action in Group II
Group I Group II
P. Tetracyclines 1. Inhibits bacterial protein synthesis by blocking peptidyl transfer
Q. Chloramphenicol 2. Inhibits bacterial protein synthesis by blocking the A-site on the
R. Cycloheximide 3. Misreads the genetic code and inhibits initiation of protein
S. Streptomycin 4. Inhibits protein synthesis by blocking peptidyl transferase on
80S ribosome
(A) P-2, Q-1, R-3, S-4 (B) P-2, Q-1, R-4, S-3
(C) P-4, Q-3, R-1, S-2 (D) P-3, Q-4, R-2, S-1
Q.19 The kinetics of an enzyme in the presence (+I) or absence (-I) of a reversible inhibitor is described
in the following graph.
If concentration of the reversible inhibitor in +I experiment was equal to 3.0 × 10–3 M, then the
dissociation constant for the enzyme-inhibitor complex is
(A) 1 × 10–3 M (B) 2 × 10–3 M (C) 3 × 10–3 M (D) 4 × 10–3 M
-4 -3 -2 -1 1 2 3 4
) M 10 (
1 1 3 
0 V
(M–1 min)

Q.20 The figure below is a schematic of a linear double stranded DNA containing the indicated
restriction sites. The DNA was completely digested with PvuII and EcoRI. The products were
purified and added to an appropriately buffered reaction mixture containing dNTP mix, α-32P
dATP, and Klenow fragment of E. coli DNA polymerase I. The Klenow reaction products were
analyzed by gel electrophoresis and autoradiography. Which of the following products depicts the
expected result?
Pvull EcoRI
2 kb 3 kb 1 kb
5 kb
4 kb
3 kb
2 kb
1 kb
5 kb
4 kb
3 kb
2 kb
1 kb
5 kb
4 kb
3 kb
2 kb
1 kb
5 kb
4 kb
3 kb
2 kb
1 kb

Q. 1 – Q. 10 carry one mark each.
Q.1 The swollen base of a petiole is known as
(A) Ligule (B) Hastule (C) Pulvinus (D) Stipule
Q.2 An estimate of phylogenetic relationships among the taxa is commonly represented in the form of a
(A) Cladogram (B) Idiogram (C) Phenogram (D) Dendrogram
Q.3 Parenchyma cells associated with sieve tube members are called
(A) Albuminous cells (B) Companion cells (C) Bulliform cells (D) Subsidiary cells
Q.4 Cytoplasmic male sterility via the chloroplast genome can be induced by the expression of Pha A
gene encoding
(A) -Ketothiolase
(B) Acetoacetyl CoA carboxylase
(C) Acetoacetyl CoA reductase
(D) PHB synthase
Q.5 The number of nucleosomes present in a 30 nm solenoid structure of a chromatin is
(A) 2 (B) 4 (C) 6 (D) 8
Q.6 Which one of the following performs normal C3 photosynthesis when water is available, but
switches to crassulacean acid metabolism (CAM) during salt or drought stress?
(A) Mesembryanthemum crystallinum (B) Cynodon dactylon
(C) Eleucine coracana (D) Hordeum vulgare
Q.7 Which one of the following is a free-living photosynthetic nitrogen fixer?
(A) Frankia (B) Clostridium (C) Rhodospirillum (D) Rhizobium
Q.8 Carbon dioxide and other ‘greenhouse gases’ act by
(A) destroying ozone in the stratosphere
(B) trapping heat in the earth’s atmosphere
(C) allowing more visible light to reach the earth’s surface
(D) reducing the amount of radiant energy which reaches the surface of the earth
Q.9 Which of the following best represents the flow of energy through an ecosystem?
(A) Producers Primary consumers Secondary consumers
(B) Sun Producers Secondary consumers Primary consumers
(C) Sun Producers Primary consumers Secondary consumers
(D) Secondary consumers Primary consumers Producers Sun
Q.10 Which one of the following drugs is obtained from the capsule of Papaver somniferum?
(A) Papain (B) Codeine (C) Digoxin (D) Bromelain

Q. 11 - Q. 20 carry two marks each.
Q.11 Which of the following statements are TRUE for plant growth regulators?
P. The release of cellulase and polygalacturonase into the cell wall is promoted by abscissic acid
Q. The early biosynthetic steps of gibberellic acid, up to the formation of ent-kaurene take place
in the plastid
R. The naturally occurring zeatin belongs to the aromatic group of cytokinins
S. Induction of protease inhibitors as a result of wounding and pathogen attack is activated by
jasmonic acid
(A) P, R (B) Q, S (C) Q, R (D) P, Q
Q.12 Which of the following statements are TRUE for the transposable elements?
P. Barbara McClintock discovered the autonomous and non-autonomous transposable elements in
Q. Variations in flower pigmentation in Antirhinum are due to the presence of transposable
elements Ac and Ds
R. The Ac transposable element is 4563 bp long and has an 11 bp inverted repeats
S. Ds produces the transposase and mobilize the Ac elements
(A) Q, S (B) P, Q (C) P, R (D) R, S
Q.13 Match the recombinant proteins produced through molecular farming with their applications.
Recombinant proteins Applications
P. Hirudine 1. HIV therapy
Q. Trichosanthin 2. Anticoagulant
R. Somatotrophin 3. Growth hormone
S. -Interferon 4. Hypertension
5. Cystic fibrosis
6. Treatment for hepatitis-B
Q.14 Which of the following statements are CORRECT for somatic cell hybridization?
P. For fusion of protoplast, dimethylsulfoxide (DMSO) is used as a fusogen
Q. The enzyme ‘Cellulase Onozuka’ used for protoplast isolation is sourced from Trichoderma
R. The first report of somatic hybrid plants resulted from the fusion of protoplasts of Nicotiana
glauca and N. tabacum
S. Viability of isolated protoplasts can be determined by Evan’s blue staining
(A) P, Q (B) Q, S (C) R, S (D) Q, R

Q.15 Which of the following statements are TRUE on transgene approach?
P. T-DNA integration occurs mainly through non-homologous recombination
Q. The Gateway cloning depends on recombination technology as opposed to standard uses of
restriction enzymes and DNA ligase
R. The localization of -glucuronidase (GUS) activity as a result of expression of GUS reporter
gene can be visualized in a histochemical assay using the X-gal
S. The green fluorescent protein gene (GFP) is isolated from the bacterium Photinus pyralis
(A) P, Q (B) Q, R (C) P, S (D) R, S
Q.16 Identify the free radicals (marked as ‘?’) in sequence from the inter-conversion of reactive oxygen
species as shown below.
O2 ? H2O2 ? H2O
2 O•
Q. OH 
2 HO 
S. 1
2 O
(A) P, Q (B) R, Q (C) P, R (D) Q, S
Q.17 With respect to adhesion and cohesion of stamens, identify the INCORRECT statements.
P. Adnation of stamens to petals is described as epiphyllous stamens
Q. In Calotropis, stamens and carpels are united to form gynostegium
R. In syngenesious stamens, filaments are united to form a bundle while the anthers are free
S. Synandrous stamens found in Cucurbita represent the union of filaments as well as anthers
(A) P, Q (B) P, R (C) Q, S (D) Q, R
Q.18 Identify the CORRECT statements in plant secondary metabolism.
P. Tropane alkaloids in Atropa belladonna are synthesized from tyrosine
Q. Antioxidative food ingredient rosmarinic acid is obtained from cell suspension cultures of
Coleus blumei
R. Thiophenes are produced from hairy root cultures of Tagetes patula
S. Cyanidin, the principal anthocyanin responsible for red color in Rosa hybrida is
produced from cinnamaldehyde
(A) P, S (B) R, S (C) P, Q (D) Q, R
Q.19 Which of the following statements are TRUE for respiration?
P. The conversion of one molecule of pyruvate to three molecules of CO2 generates four
molecules of NADH
Q. Fructose 6-phospate is the principal substrate for glycolysis
R. The oxidation of glucose 6-phosphate to 6-phosphogluconate is the first step in the oxidative
pentose phosphate pathway
S. The mitochondrial ‘alternative oxidase’ provides an alternative pathway for transfer of electrons
from ubiquinone to oxygen utilizing proton pumping complex of the respiratory chain
(A) P, R (B) P, S (C) Q, R (D) Q, S

Q.20 Match the name of the disease with the causal organism.
Disease Causal organism
P. Black rot of sugarcane 1. Cercospora personata
Q. Stem rot of jute 2. Macrophomina phaseolina
R. Tikka disease of groundnut 3. Ceratocystis adiposa
S. Crown gall of grapes 4. Synchytrium endobioticum
5. Agrobacterium tumefaciens
6. Colletotrichum corchorum

Q. 1 – Q. 10 carry one mark each.
Q.1 Which ONE of the following components is NOT an electron acceptor during anaerobic respiration?
(A) Lactate (B) Carbonate (C) Nitrate (D) Sulphate
Q.2 Bergey’s Manual of Systematic Bacteriology groups bacteria into species according to their
(A) nutritional requirement
(B) phylogenetic relationships
(C) pathogenic properties
(D) morphology
Q.3 An auxotrophic mutant arises spontaneously in a wild type E.coli culture growing in a rich medium.
Which ONE of the following techniques will ensure the isolation of the auxotrophic mutant?
(A) Replica plating (B) Streaking for single colonies
(C) Pour plating method (D) Direct microscopic observation
Q.4 Which ONE of the following mutants is used to carry out genetic analysis to determine the function
of an essential gene?
(A) Knock out mutant (B) Deletion mutant
(C) Insertion mutant (D) Temperature sensitive mutant
Q.5 An E.coli mutant constitutive for the lac operon was mated with a wild type strain. The merodiploid
thus obtained was inducible by lactose. This observation indicates that the original mutation is
(A) dominant (B) trans-dominant (C) recessive (D) cis-dominant
Q.6 A rich medium is inoculated with a bacterium that divides every 30 minutes. The number of
bacteria at the end of 50 hours is
(A) 2 1010 (B) 2 1020 (C) 1 1050 (D) 1 2100
Q.7 Which ONE of the following statements about E.coli is NOT true ?
(A) E.coli was the first disease- causing bacterium identified by Robert Koch
(B) E.coli is part of the normal microbiota of humans
(C) Certain E.coli strains can cause bloody diarrohea
(D) E.coli is beneficial to human
Q.8 Antibody coated pathogens are recognized by effector cells through
(A) CD4 receptor (B) FC receptor (C) CD8 receptor (D) IFN gamma receptor
2012 XL
XL 16/28
Q.9 Match the disease in Group I with their corresponding organism in Group II
Group I Group II
P. African sleeping sickness I. Rubulavirus
Q. Rocky mountain spotted fever II. Trypanosoma brucei
R. Mumps III. Wuchereria bancrofti
S. Filariasis IV. Rickettsia rickettsii
V. Leishmania donovani
(A) P-III, Q-V, R-II, S- I
(B) P-II, Q-I, R-III, S- IV
(C) P-II, Q-IV, R-I, S- III
(D) P-I, Q-V, R-II, S- IV
Q.10 Select the technique most appropriate to demonstrate that lactose induces the synthesis of
-galactosidase enzyme.
(A) Northern Blot
(B) Western Blot
(C) Quantitative PCR
(D) Southern Blot
Q. 11 - Q. 20 carry two marks each.
Q.11 Frederick Griffith used smooth (S) and rough (R) strains of Streptococcus pneumoniae in his
classical experiment that showed DNA might be the genetic element. Which ONE of the following
observations gave the clue for this discovery?
(A) R strain became S strain when mixed with heat killed S strain
(B) R strain remained R strain when mixed with heat killed S strain
(C) S strain became R strain when mixed with heat killed R strain
(D) R strain became S strain when mixed with live S strain
Q.12 Entry of phage lysogen to lytic phase is triggered by
(A) mutation in the genome
(B) loss of co-operativity in binding of repressor
(C) increase in the repressor concentration
(D) decrease in recA function
Q.13 Match the Phylum in Group I with their characteristic motility appendage listed in Group II
Group I Group II
P. Archaezoa I. Flagella
Q. Amoebozoa II. Fimbriae
R. Ciliophora III. Pseudopods
S. Apicomplexa IV. Cilia
V. Pili
(A) P-V, Q-II, R-IV, S-IV
(B) P-II, Q-I, R-IV, S-III
(C) P-I, Q-III, R-IV, S-I
(D) P-III, Q-II, R-IV, S-V

Q.14 Ten bacteria were inoculated into a rich medium. If at the end of ten hours the total number of cells
is 104, then the number of elapsed generations and the generation time respectively is
(A) 10, 120 minutes (B) 10, 60 minutes (C) 20, 30 minutes (D) 40, 15 minutes
Q.15 The first step in the replication of a virus with the reverse transcriptase deals with the synthesis of
(A) complementary strand of RNA
(B) double stranded RNA
(C) complementary strand of DNA
(D) double stranded DNA
Q.16 An E.coli mutant defective for an enzyme is unable to grow on acetate but grows on glycerol as the
sole carbon source. Which ONE of the following enzymes is likely to be defective in this mutant?
(A) Isocitrate dehydrogenase (B) Glyceraldehyde 3-phospahte dehydrogenase
(C) Pyruvate dehydrogenase (D) Isocitrate lyase
Q.17 Which one of the following pairs of bacterial species fixes atmospheric Nitrogen?
(A) Clostridia and Rhizobia
(B) Clostridia and Lactobacillus
(C) Rhizobia and Enterococcus
(D) Actinomycetes and Mycoplasma
Q.18 Nalidixic acid inhibits gyrase activity. Resistance to this antibiotic arises mainly due to
(A) nonsense mutation in the gyrase gene (B) deletion mutation in the gyrase gene
(C) missense mutation in the gyrase gene (D) degradation of the gyrase gene product
Q.19 Transformation of normal cyanobacterial cells into heterocysts involves
(A) synthesis of nitrogenase and retention of photosystem I
(B) synthesis of nitrogenase and loss of photosystem I
(C) loss of nitrogenase but retention of photosystem I
(D) loss of both nitrogenase and photosystem I
Q.20 Methane belched (eructation) out by cattle arises from the carbon dioxide produced
(A) during normal respiration
(B) oxidation of food stuff occurring in mitochondria
(C) lactic acid fermentation occurring in muscles
(D) bacterial fermentation occurring in the gut

Q. 1 – Q. 10 carry one mark each.
Q.2 A swimmer is preparing to swim ‘non-stop’ across the English channel (a distance of 34 kilometers).
Consumption of which of the following category of food/s should the swimmer increase to
accomplish this feat?
(A) Proteins (B) Fats
(C) Proteins and Carbohydrates (D) Carbohydrates
Q.4 Zygotic genes required for the formation of a group of adjacent segment in the developing
Drosophila embryo is called
(A) Maternal gene (B) Pair rule gene (C) Homeotic gene (D) Gap gene
Q.5 A typical receptor senses extracellular stimuli by virtue of its localization on plasma membrane.
The receptor to which of the following ligands is an exception to this rule?
(A) -amino butyric acid (B) Acetylcholine
(C) Estrogen (D) Luteinizing hormone
Q.6 The relationship between genes and enzymes was first suggested by the discovery of
(A) in-born errors of metabolism in human
(B) sexual phenotype in insects
(C) metabolic pathways in fungi
(D) gene regulation in bacteria
Q.7 The blind spot in the retina is blind because of which of the following reasons?
(A) It is the region where the optical nerve leaves the retina.
(B) The opsin is not expressed in this region.
(C) It lies in the shadow of pupil.
(D) It is the junction between rods and cones.
Q.8 Lamprey, a jawless fish, belongs to which one of the following ‘Classes’?
(A) Myxini (B) Cephalaspilomorphi
(C) Conodonta (D) Anaspida
Q.9 Chorionic gonadotropin plays an important role in the establishment and maintenance of pregnancy
and is synthesized in the placenta of
(A) Cattle (B) Pigs (C) Mice (D) Human
Q.1 Trees in the equatorial region of earth supply oxygen into the atmosphere that sustains species
living in distant polar regions. This relationship is called as
(A) mutualism (B) symbiosis
(C) commensalism (D) parasitism
Q.3 Some species of beetles and fishes can survive at sub freezing temperature. They accomplish this
by maintaining cellular integrity using one of the following mechanisms.
(A) Expressing anti-freeze proteins
(B) Accumulating fats
(C) Increasing accumulation of complex polyols
(D) Reducing the availability of total water in the body

Q.10 Glucose and hexanoic acid, each having six carbon atoms can undergo complete biological
oxidation. In terms of net ATP generation, which of the following statements is CORRECT?
(A) Glucose produces more ATP than hexanoic acid
(B) Only glucose can generate ATP
(C) Both glucose and hexanoic acid produce same amount of ATP
(D) Hexanoic acid produces more ATP than glucose
Q. 11 - Q. 20 carry two marks each.
Q.13 If all the nucleotides have equal probability of occurrence in a 4 Mbp long DNA sequence, then
how many times will the site of EcoRI, restriction endonuclease occur?
(A) 976 (B) 46 (C) 64 (D) 1000
Q.14 Seasonally breeding animals and birds measure the day length, i.e. photoperiod and use these
measurements as predictive information to prepare themselves for breeding. Besides melatonin,
which of the following hormones is involved in this biological process?
(A) Gonadotropin releasing hormone (B) Growth hormone
(C) Thyroxine (D) Adrenocorticotropic hormone
Q.15 Red-Green color blindness is an X-linked recessive disorder. In a population which is in the Hardy-
Weinberg equilibrium, the incidence of occurrence of this in males is 1:1000. What will be the
expected incidence of affected homozygous females?
(A) 1 in 1002000 (B) 1 in 2000000 (C) 1 in 1001000 (D) 1 in 1000000
Q.16 Golgi apparatus is also termed as cellular post office, since it packages and transports cellular
proteins across various organelles and outside the cell. In general, the Golgi is perinuclear in
location and is closely associated with the endoplasmic reticulum. A chemical compound,
Monensin inhibits all trafficking from Golgi. If Golgi is visualized by immunofluorescence
microscopy after treatment with this compound, the Golgi will be
(A) absent (B) normal (C) swollen (D) fragmented
Q.11 Match the following evolutionary biologists with their respective theory
I) August Weisman i) Neutral theory of molecular evolution
II) Jean-Baptiste Lamark ii) Handicap principle
III) Amotz Zahavi iii) Germ plasm theory
IV) Motoo Kimura iv) Inheritance of acquired characteristics
(A) I-ii, II-iv, III-i, IV-iii (B) I-iii, II-iv, III-ii, IV-i
(C) I-iii, II-iv, III-i, IV-ii (D) I-iii, II-i, III-iv, IV-ii
Q.12 A female cat with a mutant phenotype was bred with a wild-type male cat. All progeny (4 males
and 4 females) show the mutant phenotype. On the other hand, all progeny (4 males and 4 females)
from the reciprocal cross between a mutant male and a wild-type female show the wild-type
phenotype. Which of the following explain the inheritance pattern of the mutation?
(A) Recessive (B) Linked inheritance
(C) Mitochondrial inheritance (D) Autosomal inheritance

Q.17 In an individual, three distinct proteins bind oxygen depending on the location and development
stage. While hemoglobin is the major oxygen binding protein in adults, myoglobin is present in
skeletal muscles and fetal hemoglobin is present in fetal stage only. The following graph shows the
oxygen binding capacity of these proteins. The A, B and C plots represent oxygen binding capacity
(A) hemoglobin, fetal hemoglobin and myoglobin, respectively
(B) fetal hemoglobin, hemoglobin and myoglobin, respectively
(C) hemoglobin, myoglobin and fetal hemoglobin, respectively
(D) myoglobin, fetal hemoglobin and hemoglobin, respectively
Q.18 A patient comes with symptoms of autonomic hemolysis. The diagnostic tests reveal that he has
auto-antibodies to red blood cells (RBCs). Which one of the following mechanisms is the cause of
this condition?
(A) Neutrophils release granzymes which lyse RBCs
(B) Complement is activated and membrane attack complex lyse RBCs
(C) Cytotoxic T-cells lyse RBCs
(D) Interleukin-2 binds to the receptor on RBCs
Q.19 The nerve impulse at the neuromuscular junction results in discharge of acetylcholine (Ach) from
its vesicles into the synaptic cleft. Ach gets degraded by acetylcholine esterase and is present in
which one of the following locations?
(A) Post synaptic membrane (B) Both pre and post – synaptic clefts
(C) Presynaptic membrane (D) Synaptic cleft
Q.20 Increasing estradiol (E2) hormone from ovarian follicles prior to ovulation has been hypothesized
to play a critical role for induction of pheromones. These pheromones render females sexually
receptive to males to facilitate mating. An investigator performs experiments in sheep in which
females are gonadectomized, then treated with E2 or vehicle alone and allowed to breed. Which
one of the findings listed below will validate the hypothesis that pheromones are induced by E2?
(A) Sexual receptivity is regained only in vehicle treated females.
(B) Sexual receptivity is regained only in E2 treated females
(C) Sexual receptivity was regained irrespective of E2 treatment
(D) Sexual receptivity is not regained by any treatment
10 20 30 40 50
O2 pressure (pO2)

Q. 1 – Q. 10 carry one mark each.
Q.1 Among the following fatty acids, which group is known as essential fatty acids?
(A) 9,11-Octadecadienoic and 9,11,13-Octadecatrienoic
(B) 9,12-Octadecadienoic and 9,12,15-Octadecatrienoic
(C) 9-Octadecenoic and 9,11-Octadecadienoic
(D) 9,11-Octadecadienoic and 9-Eicosenoic
Q.2 Cellulose, the structural polysaccharide of plant, is a polymer of
(A) -D-Glucose
(B) -D-Glucose
(C) -D-Galactose
(D) -D-Galcturonic acid
Q.3 The important role of carotenoids in the human diet is their ability to serve as precursors of
(A) Vitamin C (B) Vitamin D (C) Vitamin A (D) Vitamin K
Q.4 Which one of the following microorganisms is used in the preparation of bread?
(A) Candida utilis (B) Saccharomyces cerevisiae
(C) Saccharomyces cevarum (D) Aspergilus niger
Q.5 Which one of the microorganisms given below is NOT RESPONSIBLE for ropy or stringy
fermentation of milk?
(A) Alcaligenes viscolactis
(B) Enterobacter aerogenes
(C) Streptococcus cremoris
(D) Streptococcus lactis
Q.6 A mild heat treatment of foods that destroys pathogens and extends its shelf life is called
(A) Baking (B) Blanching
(C) Sterilization (D) Pasteurization
Q.7 The most common and least expensive plastic film used for packaging of solid food materials is
(A) Polyethylene (B) Polystyrene
(C) Polypropylene (D) Polyvinylchloride
Q.8 Reassociation of amylose and formation of crystalline structure upon cooling of cooked starch
solution is termed as
(A) Synersis (B) Gelatinization
(C) Retrogradation (D) Denaturation
Q.9 Thermal destruction of microorganisms follows a kinetics of
(A) Zero order (B) First order (C) Second order (D) Fractional order
Q.10 100 kg tomato juice containing 5% Total Solids (w/w) is concentrated to 25% Total Solids (w/w).
The total amount of water removed from tomato juice in kg is
(A) 65 (B) 70 (C) 75 (D) 80

Q. 11 - Q. 20 carry two marks each.
Q.11 Which one of the following is NOT A CORRECT statement?
(A) Meatiness is the taste produced by compounds such as glutamate in products like cheese, soy
(B) Astringency is a dry mouth feel in the oral cavity that is most associated with phenolic
(C) Saltiness is a taste that is mainly produced by chloride ions.
(D) Sourness is related to acidity and is sensed by hydrogen ion channels in the human tongue.
Q.12 The following plot represents the Lineweaver-Burk equation of an enzymatic reaction both in the
presence and the absence of inhibitor. Here, V is the velocity of reaction and S is the substrate
The nature of inhibition shown in the plot is
(A) Non-competitive
(B) Anti-competitive
(C) Competitive
(D) Mixed type
Q.13 Make the correct match of the food constituents in Group I with their nature given in Group II.
Group I Group II
P) Ascorbic Acid 1) Sugar
Q) Phenyl alanine 2) Chelate
R) Dextrose 3) Amino Acid
S) Haemoglobin 4) Antioxidant
(A) P-4, Q-3, R-1, S-2 (B) P-4, Q-1, R-3, S-2
(C) P-3, Q-4, R-2, S-1 (D) P-4, Q-2, R-1, S-3
Q.14 Make the correct match of the fermented food products in Group I with the microorganisms in
Group II.
Group I Group II
P) Yoghurt 1) Lactobacillus acidophilus and Lactobacillus delbrueckii
Q) Cheese 2) Leuconostoc mesenteroides and Lactobacillus plantarum
R) Sauerkraut 3) Lactobacillus delbrueckii and Streptococcus thermophillus
S) Kefir 4) Lactobacillus casei and Streptococcus thermophillus
(A) P-1, Q-4, R-2, S-3 (B) P-4, Q-3, R-1, S-2
(C) P-3, Q-4, R-2, S-1 (D) P-3, Q-2, R-4, S-1
No inhibition

Q.15 Match the following between organelle or cellular components of a bacterium cell in Group I with
the constituents and functionalities in Group II.
Group I Group II
(A) P-3, Q-2, R-4, S-1
(B) P-4, Q-2, R-1, S-3
(C) P-3, Q-4, R-2, S-1
(D) P-2, Q-3, R-4, S-1
Q.16 Thermal death time (TDT) of Clostridium botulinum at 121C is 2.78 min with a z-value of 10C.
The TDT of the microorganism at 116C (in min) is
(A) 5.270 (B) 8.791 (C) 1.390 (D) 0.712
Q.17 Make the correct match between specific food processing operations in Group I with their
mechanism of action in Group II.
Group I Group II
P) Ball Mill 1) Compression and shear
Q) Roller Mill 2) Pressure bursting
R) Flash Peeling 3) Friction and shear
S) Abrasive Peeling 4) Impact and shear
(A) P-4, Q-2, R-1, S-3 (B) P-4, Q-1, R-2, S-3
(C) P-4, Q-3, R-2, S-1 (D) P-3, Q-1, R-4, S-2
Q.18 650 g of a wet food containing 405 g water is dried in a tray dryer to a final moisture content of
6.8 % (dry basis). It is observed that the drying process occurs under constant rate period and it
takes 8 h. The rate of drying (in kg/h) is
(A) 128.79 (B) 126.35 (C) 77.81 (D) 0.0485
Q.19 Air at 1 atmospheric pressure (101.325 kPa) and 30C with absolute humidity of 0.0218 kg/kg of
dry air is flowing in a drying chamber. The saturated vapor pressure of water ( 0
w p , in kPa) is related
to temperature (T, in C) as given below
0 5217.635
ln 18.6556
273 w p

The relative humidity of air (in percentage) is
(A) 62.82 (B) 68.22 (C) 86.62 (D) 81.80
Q.20 The total solids content in a milk sample is 18 %. It is desired to produce 1000 kg of sweetened
condensed milk (SCM) having 40 % sugar, 25 % moisture and rest milk solids. What is the ‘Sugar
Ratio’ (in percentage) in the SCM in terms of sugar and water content in the final product?
(A) 48.19 (B) 61.54 (C) 54.16 (D) 56.14
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Old February 21st, 2015, 01:52 PM
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Join Date: Apr 2013
Posts: 28,553
Default Re: GATE Life Sciences Previous 5 year Papers

GATE Life Sciences exam questions areas given below:

The Headmaster ___________ to speak to you.
Which of the following options is incorrect to complete the above sentence?
(A) is wanting
(B) wants
(C) want
(D) was wanting

Mahatama Gandhi was known for his humility as
(A) he played an important role in humiliating exit of British from India.
(B) he worked for humanitarian causes.
(C) he displayed modesty in his interactions.
(D) he was a fine human being.

Select the pair that best expresses a relationship similar to that expressed in the pair:
water: pipe::
(A) cart: road (B) electricity: wire
(C) sea: beach (D) music: instrument

In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents
respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a
randomly drawn autocomponent from the combined lot is found defective, what is the probability
that it was manufactured by M2?
(A) 0.35 (B) 0.45 (C) 0.5 (D) 0.4

All professors are researchers
Some scientists are professors
Which of the given conclusions is logically valid and is inferred from the above arguments:
(A) All scientists are researchers
(B) All professors are scientists
(C) Some researchers are scientists
(D) No conclusion follows
GATE LS paper

For detailed paper, here is attachment.............................
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