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Biological Science - 2019 Past Year Paper - IIT JAM MCQ


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60 Questions MCQ Test IIT JAM Past Year Papers and Model Test Paper (All Branches) - Biological Science - 2019 Past Year Paper

Biological Science - 2019 Past Year Paper for IIT JAM 2024 is part of IIT JAM Past Year Papers and Model Test Paper (All Branches) preparation. The Biological Science - 2019 Past Year Paper questions and answers have been prepared according to the IIT JAM exam syllabus.The Biological Science - 2019 Past Year Paper MCQs are made for IIT JAM 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Biological Science - 2019 Past Year Paper below.
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Biological Science - 2019 Past Year Paper - Question 1

Tropic hormones or tropins are secreted by

Biological Science - 2019 Past Year Paper - Question 2

Which one of the following is necessary for evolution to be driven by genetic drift?

Biological Science - 2019 Past Year Paper - Question 3

Biotin deficiency can arise due to consumption of diet rich in

Biological Science - 2019 Past Year Paper - Question 4

In a plant species, yellow seed colour (Y) is completely dominant over white (y). A genetic cross between plants with yellow seeds and plants with white seeds yielded a progeny population of 48 yellow-seeded and 52 white-seeded plants. The genotypes of the yellow-seeded and the white-seeded parent plants, respectively, are most likely to be

Biological Science - 2019 Past Year Paper - Question 5

Thomas Cech discovered RNA self-splicing in

Biological Science - 2019 Past Year Paper - Question 6

The core glycan moiety of N-linked glycoproteins contains

Biological Science - 2019 Past Year Paper - Question 7

Organophosphate pesticides kill insects by inhibiting

Biological Science - 2019 Past Year Paper - Question 8

Which one of the following conditions leads to an approximately 50-fold increase in RNA transcription of the lac operon? (CRP stands for cyclic AMP [cAMP] receptor protein)
P: Binding of CRP-cAMP complex to a site near the lac promoter
Q: Binding of CRP-cAMP complex to a site near the lac operator
R: Lac repressor bound to the lac operator
S: Lac repressor not bound to the lac operator

Biological Science - 2019 Past Year Paper - Question 9

Which one of the following photosynthetic organisms does not release oxygen as a by-product of the light reaction?

Biological Science - 2019 Past Year Paper - Question 10

In plant systematics, which one of the following species belongs to the branch at the very base of the angiosperm phylogenetic tree?

Biological Science - 2019 Past Year Paper - Question 11

The molecular weight (Da) of the zwitterionic form of the peptide GAGAGAGA is closest to

Biological Science - 2019 Past Year Paper - Question 12

If y = x2, then dx/dy is 

Biological Science - 2019 Past Year Paper - Question 13

Which one of the following plots represents exponential growth?

Biological Science - 2019 Past Year Paper - Question 14

Naive T lymphocytes can be stimulated by the activated dendritic cells that bear

Biological Science - 2019 Past Year Paper - Question 15

In rearrangement of immunoglobulin heavy chain, N-nucleotides

Biological Science - 2019 Past Year Paper - Question 16

Which one of the following matches is CORRECT between the microorganisms given in Group A with their requirement of oxygen in Group B?

Biological Science - 2019 Past Year Paper - Question 17

Which one of the following is TRUE for the function  = x2 + 1?

Biological Science - 2019 Past Year Paper - Question 18

Match the metabolic pathways in Group A with corresponding enzymes in Group B

Biological Science - 2019 Past Year Paper - Question 19

Which one of the following statements is INCORRECT for competitive inhibition in an enzyme catalysed reaction?

Biological Science - 2019 Past Year Paper - Question 20

In a human cell, β-oxidation of a saturated fatty acyl CoA molecule produced 8 acetyl CoA, 7 H2O and 28 ATP. The oxidised fatty acyl CoA is 

Biological Science - 2019 Past Year Paper - Question 21

Match the diseases in Group A with their corresponding causative microorganisms in Group B

Biological Science - 2019 Past Year Paper - Question 22

In an experiment to examine the role of exopolymeric substances (EPS) on bacterial growth, a wildtype strain (S+) and a mutant strain deficient in EPS production (S) were grown in monocultures as well as in co-culture (in equal proportion of S+and S). The CFU (colony forming units) of these cultures measured after 24 hours are shown in the following figure.

Q. Which one of the following phenomena best describes the interaction between the wild-type strain (S+ ) and mutant strain (S)?

Biological Science - 2019 Past Year Paper - Question 23

If a fossil that has been discovered recently contains 0.2% of the that was present when the fossil was formed, then the age of the fossil in years is likely to fall in the range of

Biological Science - 2019 Past Year Paper - Question 24

A photosynthetic algal filament is illuminated with white light that has passed through a prism such that the left and the right ends of the filament receive violet and red lights, respectively. The amount of oxygen released by this filament will be

Biological Science - 2019 Past Year Paper - Question 25

Which one of the following statements is TRUE for dynein and kinesin family of motor proteins?

Biological Science - 2019 Past Year Paper - Question 26

Which one of the following statements is TRUE about flagella?

Biological Science - 2019 Past Year Paper - Question 27

Caffeine is a plant-based drug that

Biological Science - 2019 Past Year Paper - Question 28

2,4-Dinitrophenol (DNP) is an uncoupler that

Biological Science - 2019 Past Year Paper - Question 29

Which one of the following statements is INCORRECT about the prokaryotic and eukaryotic organisms on the Earth?

Biological Science - 2019 Past Year Paper - Question 30

Which is the CORRECT chronological order, from the least recent to the most recent, of the four evolutionary events listed below?
P. Earliest evidence of terrestrial arthropods
Q. Appearance of  Ediacaran fauna
R. Extinction of the large, non-flying dinosaurs
S. Origin of mammals

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 31

Which of the following changes would cause a shift in the membrane potential of a neuronal cell from –70 mV to –50 mV?

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 32

In this system of two reactions, A → 2B and B → 2C , which of the following statements is/are TRUE at steady-state?

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 33

The function f(x) =  x2 − 6x + 8 is positive when

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 34

A typical α-helix in a native polypeptide chain has

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 35

Insulin action on a target cell causes an increase in

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 36

Which of the following statements is/are TRUE for the function f(x) shown in the figure given below?

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 37

Which of the following coenzymes is/are present in the pyruvate dehydrogenase complex?

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 38

Which of the following disorders in humans is/are due to a defect/deficiency in enzymes involved in the urea cycle?

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 39

Ricin, a protein from castor beans, causes toxicity in humans by

*Multiple options can be correct
Biological Science - 2019 Past Year Paper - Question 40

During photosynthesis in higher plants, oxygen is produced

*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 41

The function f(x) = sin(x) e−x is equal to zero in the range 0 < x < 2π for x =____ radians (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 42

A spherical bacterium has a diameter of 2 µm. Its volume to surface area ratio is equal to ____ µm (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 43

The value of the integral is equal to ____ (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 44

The velocity of an enzyme-catalysed reaction following Michaelis–Menten kinetics, at the substrate concentration equal to 0.3×Km, is equal to ____ × Vmax (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 45

The angle (in degrees) between the hour hand and the minute hand of a 12-hour clock showing 6:30 is ___ (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 46

Values of (standard Gibbs free energy of formation) for molecules A, B, and C are –34 kJ/mol, 84 kJ/mol and –100 kJ/mol, respectively. The for the reaction  +  →  would be ____ kJ/mol (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 47

A bacterial population in the log-phase grows from 4 × 106 cells to 8.64 × 106 cells in 20 minutes. The doubling time of the bacterium is ____ minutes (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 48

Tryptophan (Trp) is encoded by UGG, phenylalanine (Phe) is encoded by UUU and UUC, isoleucine (Ile) is encoded by AUU, AUC and AUA, and glycine (Gly) is encoded by GGU, GGC, GGA and GGG. The maximum number of RNA segments with unique sequences that can encode the polypeptide Ile-Phe-Trp-Ile-Gly-Trp would be ____


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 49

In an examination consisting of 100 multiple choice questions, each question has four choices out of which only one is correct. A student scores +1 for each correct answer and a negative mark of 1/5 for each wrong answer. The correct choices are uniformly distributed across the four choices. If an unprepared student always selects the first choice for each question, then the expected value of the student’s total score in the examination would be ____ (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 50

In a large insect population, males and females are equally abundant. If a student collects four insects from this population at random, the probability that all of them are male is ____ (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 51

An E. coli cell with an internal volume of 2 femtolitres contains 10 molecules of a repressor protein in its cytosol.  The concentration of the repressor protein is ____ nM (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 52

The growth rate of a bacterial culture is given by  where x is the density of the culture. The growth rate is maximum when the density is equal to ____ (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 53

A hypothetical plant forms 10 leaves, each of which is perfectly circular with 10 cm diameter. If the total number of stomata made by all these leaves is 7.85 × 106, then the stomatal density in these leaves would be ____ / mm2 (round off to 1 decimal place)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 54

In a diploid population at Hardy–Weinberg equilibrium, the locus A has two alleles A1 and A2. If the frequency of A1A1 genotype is 0.01, then the frequency of the allele A2 is ____ (round off to 2 decimal places) 


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 55

In the following figure, the radius of the circle circumscribing the regular hexagon is 2 cm. The area of the shaded region is  ____ cm2 (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 56

The complete oxidation of one mole of palmitoyl CoA yields 23 moles of water and 16 moles of carbon dioxide. The amount of water that can be produced from 1 kg of tripalmitate is ____ mL (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 57

If x, y, and z are all positive and x + y + z = 9, the maximum value of xyz is ____


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 58


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 59

In the second-order reaction 2A → B, the initial concentration of A is 1.0 M and after 30 minutes, the concentration of A is 0.5 M. The rate constant of the reaction is ____ L/mol/h (round off to 2 decimal places)


*Answer can only contain numeric values
Biological Science - 2019 Past Year Paper - Question 60

Water from a full cylindrical vessel of height h and of unknown diameter is completely emptied to precisely fill two cylindrical vessels of the same diameter d and heights h and 3h. The diameter of the original vessel is ____ × d (round off to 2 decimal places) 


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