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Objective Questions

Latest GATE Life Science Exam Question (Objective Questions), MCQ in English

Subjects : General Aptitude, Section P(Chemistry), XL-Q – Biochemistry, XL-R – Botany

Question Bank GATE Life Science Exam - English
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General Aptitude

Question 1Single Answer
Inhaling the smoke from a burning _____ could _____ you quickly.
  1. A
    tire/tier
  2. B
    tire/tyre
  3. C
    tyre/tire
  4. D
    tyre/tier
Question 2Single Answer
Rice, a versatile and inexpensive source of carbohydrate, is a critical component of diet worldwide. Climate change, causing extreme weather, poses a threat to sustained availability of rice. Scientists are working on developing Green Super Rice (GSR), which is resilient under extreme weather conditions yet gives higher yields sustainably.
Which one of the following is the CORRECT logical inference based on the information given in the above passage ?
  1. A
    GSR is an alternative to regular rice, but it grows only in an extreme weather
  2. B
    GSR be used in future in response to adverse effects of climate change
  3. C
    GSR grows in an extreme weather, but the quantity of produce is lesser than regular rice
  4. D
    Regular rice will continue to provide good yields even in extreme weather
Question 3Single Answer
Given below are three statements and four conclusions drawn based on the statements.
Statement 1: Some engineers are writers.
Statement 2: No writer is an actor.
Statement 3: All actors are engineers.
Conclusion I: Some writers are engineers.
Conclusion II: All engineers are actor.
Conclusion III: No actors is a writer.
Conclusion IV: Some actors are writers.
Which one of the following options can be logically inferred ?
  1. A
    Only conclusion I is correct
  2. B
    Only conclusion II and conclusion III are correct
  3. C
    Only conclusion I and conclusion III are correct
  4. D
    Either conclusion III or conclusion IV is correct
Question 4Single Answer
You should_____ when to say _____ .
  1. A
    no/no
  2. B
    no/know
  3. C
    know/know
  4. D
    know/no
Question 5Single Answer
Healthy eating is a critical component of healthy aging. When should one start eating healthy ? It turns out that it is never too early. For example, babies who start eating healthy in the first year are more likely to have better overall health as they get older.
Which one of the following is the CORRECT logical inference based on the information in the above passage ?
  1. A
    Healthy eating is important for those with good health conditions, but not for others
  2. B
    Eating healthy can be started at any age, earlier the better
  3. C
    Eating healthy and better overall health are more correlated at a young age, but not older age
  4. D
    Healthy eating is more important for adults than kids
Question 6Single Answer
The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is :
  1. A
    15
  2. B
    16
  3. C
    18
  4. D
    25
Question 7Single Answer
Pipes P and Q can fill a storage tank full of water in 10 and 6 minutes, respectively. Pipe R draws the water out from the storage tank at a rate of 34 litres per minute. P, Q and R operate at a constant rate. If it takes one hour to completely empty a full storage tank with all the pipes operating simultaneously, what is the capacity of the storage tank (in litres) ? 
  1. A
    26.8 
  2. B
    60.0 
  3. C
    120.0
  4. D
    127.5
Question 8Single Answer
Six persons P, Q, R, S, T and U are sitting around a circular table facing the centre not necessarily in the same order. Consider the following statements:
• P sits next to S and T.
• Q sits diametrically opposite to P
• The shortest distance between S and R is equal to the shortest distance between T and U. Based on the above statements, Q is a neighbour of
  1. A
    U and S
  2. B
    R and T
  3. C
    R and U
  4. D
    P and S
Question 9Single Answer
Consider the following inequalities.
I 3p – q < 4
II 3q – p < 12
Which one of the following expressions below satisfies the above two inequalities ?
 
  1. A
    p + q < 8
  2. B
    p + q = 4
  3. C
    8 ≤p + q <16
  4. D
    p + q ≥ 16
Question 10Single Answer
Two straight lines pass through the origin = (0,0). One of them passes through the point = (1,3) and the other passes through the point = (1, 2).What is the area enclosed between the straight lines in the interval, [0,1] on the -axis ?
  1. A
    0.5
  2. B
    1.0
  3. C
    1.5
  4. D
    2.0

Section P(Chemistry)

Question 11Single Answer
Consider a second order reaction, 2A → Product The concentration of A is represented as [A].
Which of the following is the CORRECT plot for determining the rate constant for the above reaction ?
  1. A
  2. B
  3. C
  4. D
Question 12Single Answer
Which among the following has the least second ionization energy ?
  1. A
    Al
  2. B
    Si
  3. C
    P
  4. D
    S
Question 13Single Answer
Which among the following metal ions has the highest enthalpy of hydration ?
(Assume the given metal ions have the same counter ion.)
Given : Atomic numbers of Ti, V, Cr and Mn are 22, 23, 24 and 25, respectively.
  1. A
  2. B
    V2+
  3. C
    Cr2+
  4. D
    Mn2+
Question 14Single Answer
Among the following, the one having smallest bond angle is ?
  1. A
    PH3
  2. B
    PF3
  3. C
    NF3
  4. D
    NH3
Question 15Single Answer
Which of the following is the CORRECT statement about hexoses ?
  1. A
    D - mannose is C - 4 epimer of D - glucose
  2. B
    D - galactose is C - 2 epimer of D - glucose
  3. C
    D - glucose and L - glucose are diastereomers
  4. D
    D - glucose and D - galactose are diastereomers
Question 16Single Answer
The bases present in DNA are ?
  1. A
    adenine, cytosine, guanine and thymine
  2. B
    adenine, guanine, thymine and uracil
  3. C
    adenine, cytosine, thymine and uracil
  4. D
    cytosine, guanine, thymine and uracil
Question 17Single Answer
The CORRECT order of basicity for the following compounds is ?
  1. A
    I > II > III
  2. B
    II > III > I
  3. C
    II > 1 > III
  4. D
    III > 1 > II
Question 18Single Answer
Molar conductance of monobromoacetic acid at infinite dilution is calculated to be x× 10-4 S m2 moI-1 at 25℃.
The value of x is (round off to the nearest integer) Given :
Electrolyte                    Limiting molar conductance at 25℃ in 10-4S m2 moI-1
HBr                                                                     427.95
KBr                                                                     151.64
CH2BrCOOK                                                        112.72
  1. A
    164
  2. B
    195
  3. C
    389
  4. D
    467
Question 19Single Answer
Among the following statements about cobalt complexes, which is/are CORRECT ?
Given : Atomic number of Co is 27
  1. A
    exhibits square planar geometry
  2. B
     does not show optical isomerism (en = ethylenediamine)
  3. C
     is paramagnetic in nature
  4. D
     shows ligand - to - metal charge transfer
Question 20Single Answer
The geometry of Fe(CO)5 is
(Given : Atomic number of Fe = 26)
  1. A
    pentagonal planar
  2. B
    square pyramidal
  3. C
    trigonal bipyramidal
  4. D
    trigonal pyramidal
Question 21Single Answer
The structure of the major product Q of the following reaction is ?
  1. A
  2. B
  3. C
  4. D
Question 22Single Answer
The CORRECT order of acidity of the following compounds is ?
  1. A
    II > I > III
  2. B
    II > III > I
  3. C
    III > II > I
  4. D
    III > I > II
Question 23Single Answer
The O – O bond order in O22- species is ?
  1. A
    0.5
  2. B
    1.0
  3. C
    1.5
  4. D
    2.0
Question 24Single Answer
For a reaction X → Products
Group I contains three plots of reactant concentrations as function of time, where x = concentration of reactant X at time t; x0 = concentration of reactant X at initial time, t = 0. Group II gives a list of different orders of reaction. Match the plots with the order of the reaction.
  1. A
    (P) - (1), (Q) - (2), (R) - (3)
  2. B
    (P) - (3), (Q) - (2), (R) - (1)
  3. C
    (P) - (2), (Q) - (3), (R) - (1)
  4. D
    (P) - (2), (Q) - (1), (R) - (3)
Question 25Single Answer
The structure of the major product S of the following reaction is ?
  1. A
  2. B
  3. C
  4. D

XL-Q – Biochemistry

Question 26Single Answer
Which of the immune cells listed below are agranular ?
P. Eosinophils
Q. Mast cells
R. Monocytes
S. T4e11s
  1. A
    P and Q only
  2. B
    Q and R only
  3. C
    Rand S only
  4. D
    S and P only
Question 27Single Answer
Which one of the following enzymes is located in the outer mitochondrial membrane ?
  1. A
    Citirate synthase
  2. B
    Fumarase
  3. C
    Monoamine oxidase
  4. D
    Succinate dehydrogenase
Question 28Single Answer
Which one of the following statements about the DNA polymerase III of E. coli is NOT correct ?
  1. A
    It catalyzes nick translation
  2. B
    Its absence is lethal to E. coli
  3. C
    It synthesizes a complementary DNA strand using a single-stranded template
  4. D
    it possesses 3' → 5' exonuclease activity
Question 29Single Answer
Which one of the following compounds is NOT a translation inhibitor ?
  1. A
    Chloramphenicol
  2. B
    Cycloheximide
  3. C
    Puromycin
  4. D
    Rifampicin
Question 30Single Answer
Filamentous photosynthetic algae were placed on a microscopic slide and illuminated with light of different colors as illustrated.

The bacteria that are known to migrate towards the region of high 02 were also added uniformly on the slide. Which one of the following options illustrates the distribution of bacteria along the length of the microscopic slide after illumination ?
  1. A
  2. B
  3. C
  4. D
Question 31Single Answer
Two RNAs shown below were used separately as templates in an in vitro translation system, which can generate proteins in all possible reading frames.
RNA1 : 5' – (AG)n–3'
RNA2 : 5' – (AAGn–3'
The RNA1 translated product contained Arg and Glu.
The RNA2 translated product contained Arg, Glu, and Lys.
Which one of the following codons directs the incorporation of Arg ?
  1. A
    AAG
  2. B
    AGA
  3. C
    GAA
  4. D
    GAG
Question 32Single Answer
Which of the following statements about endogenous synthesis of insulin are correct ? P. Insulin is synthesized as preproinsulin.
Q. Preproinsulin is converted to proinsulin.
R. Single - site cleavage ofproinsulin eliminates C chain.
S. Mature insulin consists of disulphide-linked A and B chains.
  1. A
    P, Q and R
  2. B
    P, Q and S
  3. C
    P, R and S
  4. D
    Q, R and S
Question 33Single Answer
Which one of the following enzymes converts testosterone to estradiol ?
  1. A
    Aromatase
  2. B
    3β - hydroxysteroid dehydrogenase
  3. C
    5α - reductase
  4. D
    17 β - hydroxysteroid dehydrogenase
Question 34Single Answer
Purification of 6 x His - tagged protein using Ni - NTA column is an example of ______
  1. A
    affinity chromatography
  2. B
    hydrophobic - interaction chromatography
  3. C
    ion - exchange chromatography
  4. D
    size - exclusion chromatography
Question 35Single Answer
Which of the following molecules (~ 1mg/mL) do NOT absorb at 280 nm in an aqueous solution of pH 7.00 at room temperature ?
  1. A
    Poly deoxy - Guanylate (poly dG)
  2. B
    Adenosine triphosphate
  3. C
    Phenylalanine
  4. D
    Tyrosine
Question 36Single Answer
A molecule that forms a donor - acceptor energy transfer pair with the dansyl group is _____
  1. A
    Aspartate
  2. B
    Histidine
  3. C
    Lysine
  4. D
    Tryptophan
Question 37Single Answer
The stationary phase used in gel filtration chromatography is composed of ?
  1. A
    Blue dextran
  2. B
    Carboxymethyl (CM) cellulose
  3. C
    Diethylamlnoethyl (DEAE) cellulose
  4. D
    Sepharose
Question 38Single Answer
According to the “wobbLe hypothesis” inosine at the third position of the anticodon cannot form hydrogen bonds with ____
  1. A
    Adenine
  2. B
    Cytidine
  3. C
    Guanine
  4. D
    Uracil
Question 39Single Answer
pKa value of the guanidinium group of Arginine is _____
  1. A
    4.30
  2. B
    7.40
  3. C
    9.20
  4. D
    12.50
Question 40Single Answer
The non - coenzyme vitamine is _____
  1. A
    Ascorbic acid
  2. B
    Folic acid
  3. C
    Nicotinic acid
  4. D
    Thiamine
Question 41Single Answer
Telomerase has a function similar to ____ ?
  1. A
    DNA dependent DNA polymerase
  2. B
    RNA polymerase
  3. C
    DNA gyrase
  4. D
    Reverse transcriptase
Question 42Single Answer
Which one of the following enzymes is used in Polymerase Chain Reaction ?
  1. A
    Klenow fragment
  2. B
    Taq polymerase
  3. C
    T7 polymerase
  4. D
    Primase
Question 43Single Answer
In hepatocytes, the detoxification of drugs occurs in ____
  1. A
    Golgi apparatus
  2. B
    Nucleolus
  3. C
    Rough endoplasmic reticulum
  4. D
    Smooth endoplasmic reticulum
Question 44Single Answer
Which one of the following antibiotics can form an ion channel in the bacterial membrane ?
  1. A
    Ampicillin
  2. B
    Grarnicidin A
  3. C
    Gentamicin
  4. D
    Rifampicin
Question 45Single Answer
Which one of the following cells lack hypoxanthine - guanine Phosphoribosyt transferase (HGPRT) ?
  1. A
    B Cell
  2. B
    T Cell
  3. C
    Macrophage
  4. D
    Myeloma Cell

XL-R – Botany

Question 46Single Answer
In Angiosperms, normally 'Exarch Xylem’ occurs in ?
  1. A
    dicot stem
  2. B
    monocot stem
  3. C
    dicot root
  4. D
    dicot leaf
Question 47Single Answer
'Quiescent Center’ is present in ?
  1. A
    leaf meristem
  2. B
    root apical meristem
  3. C
    shoot apical meristem
  4. D
    floral meristem
Question 48Single Answer
With reference to virulence (vir) region of nopaline type Ti plasmid of Agrobacterium tumefactens , match Group - I (vir gene) and Group - II (coded protein) in CORRECT combination.
Group - I                                            Group - II
P. vir A                             I. Single strand T - DNA binding protein
Q. virB                             II. Topoisomerase
R. vir E                            III. Membrane protein, channel for T - DNA
S. vir D                            IV. Sensor protein, constitutive expression
  1. A
    P - IV, Q - III, R - II, S - I
  2. B
    P - IV, Q - III, R - I, S - II
  3. C
    P - IV, Q - II, R - I, S - III
  4. D
    P - I, Q - III, R - H, S - IV
Question 49Single Answer
Anomalous secondary growth is observed in ?
  1. A
    Triticum
  2. B
    Oryza
  3. C
    Zea
  4. D
    Dracaerba
Question 50Single Answer
An Arabidopsis thaliana mutant plant developed defective flowers with altered floral organ identity and patterning. In this mutant, the four floral whorls contain Sepal – Sepal – Carpel - Carpel, from the periphery to the center of the flower. Based on the typical ABC model of floral organ patterning, which among the following are mutated in this plant ?
  1. A
    Class A gene(s)
  2. B
    Class B gene(s)
  3. C
    Class C gene(s)
  4. D
    Double mutant for Class A and Class C genes
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