GATE Exam 2022 Biotechnology (BT) Question Paper With Answer Key


BT: Biotechnology

General Aptitude

Q.1 – Q.5 Carry ONE mark each.

1. You should _________ when to say _________.

(A)  no / no

(B)  no / know

(C)  know / know

(D)  know / no

Answer: (D)

2. Two straight lines pass through the origin (x0, y0) = (0,0). One of them passes through the point (x, y1) = (1,3) and the other passes through the point (x2, y2) = (1, 2).

What is the area enclosed between the straight lines in the interval [0, 1] on the 𝑥-axis?

(A)  0.5

(B)  1.0

(C)  1.5

(D)  2.0

Answer: (A)

3. If

p ∶ q = 1 ∶ 2

q ∶ r = 4 ∶ 3

r ∶ s = 4 ∶ 5

and u is 50% more than s, what is the ratio p ∶ u?

(A)  2 : 15

(B)  16 :15

(C)  1 : 5

(D)  16 : 45

Answer: (D)

4. Given the statements:

• P is the sister of Q.

• Q is the husband of R.

• R is the mother of S.

• T is the husband of P.

Based on the above information, T is ______ of S.

(A)  the grandfather

(B)  an uncle

(C)  the father

(D)  a brother

Answer: (B)

5. In the following diagram, the point R is the center of the circle. The lines PQ and ZV are tangential to the circle. The relation among the areas of the squares, PXWR, RUVZ and SPQT is

(A)  Area of SPQT = Area of RUVZ = Area of PXWR

(B)  Area of SPQT = Area of PXWR = Area of RUVZ

(C)  Area of PXWR = Area of SPQT = Area of RUVZ

(D)  Area of PXWR = Area of RUVZ = Area of SPQT

Answer: (B)

Q.6 – Q. 10 Carry TWO marks each.

6. 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?

(A)  Healthy eating is important for those with good health conditions, but not for others

(B)  Eating healthy can be started at any age, earlier the better

(C)  Eating healthy and better overall health are more correlated at a young age, but not older age

(D)  Healthy eating is more important for adults than kids

Answer: (B)

7. P invested Rs. 5000 per month for 6 months of a year and Q invested Rs. x per month for 8 months of the year in a partnership business. The profit is shared in proportion to the total investment made in that year.

If at the end of that investment year, Q receives 4/9 of the total profit, what is the value of x (in Rs.) ?

(A)  2500

(B)  3000

(C)  4687

(D)  8437

Answer: (B)


The above frequency chart shows the frequency distribution of marks obtained by a set of students in an exam.

From the data presented above, which one of the following is CORRECT?

(A)  mean > mode > median

(B)  mode > median > mean

(C)  mode > mean > median

(D)  median > mode > mean

Answer: (B)

9. In the square grid shown on the left, a person standing at P2 position is required to move to P5 position.

The only movement allowed for a step involves, “two moves along one direction followed by one move in a perpendicular direction”. The permissible directions for movement are shown as dotted arrows in the right.

For example, a person at a given position Y can move only to the positions marked X on the right.

Without occupying any of the shaded squares at the end of each step, the minimum number of steps required to go from P2 to P5 is

(A)  4

(B)  5

(C)  6

(D)  7

Answer: (B)


Consider a cube made by folding a single sheet of paper of appropriate shape. The interior faces of the cube are all blank. However, the exterior faces that are not visible in the above view may not be blank.

Which one of the following represents a possible unfolding of the cube?

Answer: (MTA)


Q.11 – Q.35 Carry ONE mark each.

11. What is the order of the differential equation given below?

(A)  1

(B)  2

(C)  3

(D)  4

Answer: (B)

12. If the eigenvalues of a 2×2 matrix P are 4 and 2, then the eigenvalues of the matrix P1 are

(A)  0, 0

(B)  0.0625, 0.25

(C)  0.25, 0.5

(D)  2, 4

Answer: (C)

13. For a double-pipe heat exchanger, the inside and outside heat transfer coefficients are 100 and 200 W m2 K1, respectively. The thickness and thermal conductivity of the thin-walled inner pipe are 1 cm and 10 W m1 K1, respectively. The value of the overall heat transfer coefficient is _______ W m-2 K1.

(A)  0.016

(B)  42.5

(C)  62.5

(D)  310

Answer: (C)

14. Match the media component (Column I) with its role (Column II).

(A)  P-1, Q-2, R-3, S-4

(B)  P-2, Q-1, R-3, S-4

(C)  P-3, Q-2, R-4, S-1

(D)  P-3, Q-4, R-2, S-1

Answer: (D)

15. The binding free energy of a ligand to its receptor protein is −11.5 kJ mol1 at 300 K. What is the value of the equilibrium binding constant?

User R = 8.314 J mol1K1.

(A)  0.01

(B)  1.0

(C)  4.6

(D)  100.5

Answer: (D)

16. The overall stoichiometry for an aerobic cell growth is

3C6H12O6 + 2.5NH3 + O2 → 1.5CaHbOcNd + 3CO2 + 5H2O

What is the elemental composition formula of the biomass?

(A)  C9H18.2O5N1.667

(B)  C9H22.33O6N1.667

(C)  C10H18.2O5N1.667

(D)  C10H22.33O6N1.667

Answer: (D)

17. In binomial nomenclature, the name of a bacterial strain is written with the first letter of ______ word(s) being capitalized.

(A)  first

(B)  second

(C)  neither

(D)  first and second

Answer: (A)

18. The type of nucleic acid present in λ-phage is

(A)  Double stranded DNA

(B)  Single stranded circular DNA

(C)  Single stranded DNA

(D)  Single stranded RNA

Answer: (A)

19. Which of the following statements about reversible enzyme inhibitors are CORRECT?

(P) Uncompetitive inhibitors bind only to the enzyme-substrate complex

(Q) Non-competitive inhibitors bind only at a different site from the substrate

(R) Competitive inhibitors bind to the same site as the substrate

(A)  P and Q only

(B)  P and R only

(C)  Q and R only

(D)  P, Q and R

Answer: (D)

20. Match the component of eukaryotic cells (Column I) with its respective function (Column II).

(A)  P-1, Q-2, R-3, S-4

(B)  P-2, Q-1, R-3, S-4

(C)  P-3, Q-1, R-2, S-4

(D)  P-4, Q-3, R-1, S-2

Answer: (A)

21. In animal cells, the endogenously produced miRNAs silence gene expression by

(A)  base pairing with the 3′-untranslated region of specific mRNAs

(B)  blocking mRNA synthesis

(C)  binding to the operator site

(D)  base pairing with the 3′ region of specific rRNAs

Answer: (A)

22. Terpenoids are made of ________ units

(A)  amino acid

(B)  carbohydrate

(C)  isoprene

(D)  triacylglycerol

Answer: (C)

23. Match the microbial product (Column I) with its respective application (Column II).

(A)  P-1, Q-2, R-3

(B)  P-2, Q-1, R-3

(C)  P-3, Q-2, R-1

(D)  P-3, Q-1, R-2

Answer: (D)

24. Which of the following is NOT used for generating an optimal alignment of two nucleotide sequences?

(A)  Gap penalties

(B)  Match scores

(C)  Mismatch scores

(D)  Nucleotide composition

Answer: (D)

25. The recognition sequences of four Type-II restriction enzymes (RE) are given below. The symbol (↓) indicates the cleavage site. Identify the RE that generates sticky ends.

(A)  RE1 – 5̍ G↓GATCC 3̍

(B)  RE2 – 5̍ CTG↓CAG 3̍

(C)  RE3 – 5̍ CCC↓GGG 3̍

(D)  RE4 – 5̍ AG↓CT 3̍

Answer: (A)

26. Among individuals in a human population, minor variations exist in nucleotide sequences of chromosomes. These variations can lead to gain or loss of sites for specific restriction enzymes. Which of the following technique is used to identify such variations?

(A)  Polymerase dependent fragment insertion

(B)  Real-time polymerase chain reaction

(C)  Restriction fragment length polymorphism

(D)  Reverse transcriptase polymerase chain reaction

Answer: (C)

27. Assuming independent assortment and no recombination, the number of different combinations of maternal and paternal chromosomes in gametes of an organism with a diploid number of 12 is _________.

Answer: (64 to 64)

28. A microorganism is grown in a batch culture using glucose as a carbon source. The apparent growth yield is 0.5  The initial concentrations of biomass and substrate are 2 g L1 and 200 g L1, respectively. Assuming that there is no endogenous metabolism, the maximum biomass concentration that can be achieved is ______ g L1.

Answer: (102 to 102)

29. The degree of reduction of lactic acid (C3H6O3) is _________.

Answer: (4 to 4)

30. Consider a nonlinear algebraic equation, xlnx + x − 1 = 0. Using the Newton-Raphson method, with the initial guess of x0 = 3, the value of 𝑥 after one iteration (rounded off to one decimal place) is _______.

Answer: (1.2 to 1.4)

31. The probability density function of a random variable X is p(x) = 2e2x. The probability P(1 ≤ X ≤ 2) (rounded off to two decimal places) is _______.

Answer: (0.11 to 0.13)

32. The maximum value of the function f (x) = 3x2 − 2x3 for x > 0 is _____.

Answer: (1 to 1)

33. The specific growth rate of a yeast having a doubling time of 0.693 h (rounded off to nearest integer) is_______h1.

Answer: (1 to 1)

34. A fermentation broth of density 1000 kg m3 and viscosity 103 kg m1 s1 is mixed in a 100 L fermenter using a 0.1 m diameter impeller, rotating at a speed of 2 s1.The impeller Reynolds number is _______.

Answer: (20000 to 20000)

35. For a pure species, the slope of the melting line  at −2°C is −0665 × 106 Pa K1.

The difference between the molar volumes of the liquid and solid phase at −2°C −4.5 × 106 m3mol1.

The value of the latent heat of fusion (rounded off to nearest integer) is ________ J mol1.

Answer: (6067 to 6223)

Q.36 – Q.65 Carry TWO marks each.

36. Which of the following conditions will contribute to the stability of a gene pool in a natural population?

(P) Large population

(Q) No net mutation

(R) Non-random mating

(S) No selection

(A)  P only

(B)  P and Q only

(C)  P and R only

(D)  P,Q and S only

Answer: (D)

37. Match the media component used in mammalian cell culture (Column I) with its respective role (Column II).

(A)  P-3, Q-4, R-1, S-2

(B)  P-3, Q-4, R-2, S-1

(C)  P-4, Q-3, R-1, S-2

(D)  P-4, Q-3, R-2, S-1

Answer: (A)

38. Match the cell type (Column I) with its function (Column II)

(A)  P-1, Q-2, R-3, S-4

(B)  P-1, Q-4, R-2, S-3

(C)  P-4, Q-3, R-1, S-2

(D)  P-4, Q-3, R-2, S-1

Answer: (B)

39. A 2×2 matrix P has an eigenvalue λ1 = 2 with eigvenvector  and another eigenvalue λ2 = 5, with eigenvector  The matrix  P is

Answer: (B)

40. Match the stationary phase (Column I) with its corresponding chromatography technique (Column II).

(A)  P-1, Q-4, R-2, S-3

(B)  P-3, Q-1, R-4, S-2

(C)  P-3, Q-4, R-2, S-1

(D)  P-4, Q-1, R-3, S-2

Answer: (B)

41. Which of the following statements are CORRECT for a controller?

(P) In a proportional controller, a control action is proportional to the error

(Q) In an integral controller, a control action is proportional to the derivative of the error

(R) There is no “offset” in the response of the closed-loop first-order process with a proportional controller

(S) There is no “offset” in the response of the closed-loop first-order process with a proportional-integral controller

(A)  P and Q only

(B)  P and R only

(C)  P and S only

(D)  Q and S only

Answer: (C)

42. Which of the following are CORRECT about protein structure?

(P) Secondary structure is formed by a repeating pattern of interactions among the polypeptide backbone atoms

(Q) Tertiary structure is the three-dimensional arrangement of the polypeptide backbone atoms only

(R) Quaternary structure refers to an assembly of multiple polypeptide subunits

(A)  P and Q only

(B)  P and R only

(C)  Q and R only

(D)  P, Q and R

Answer: (B)

43. The enzymes involved in ubiquitinylation of cell-cycle proteins are

(A)  E1 and E2 only

(B)  E1 and E3 only

(C)  E1 and E4 only

(D)  E1, E2 and E3

Answer: (D)

44. The maximum parsimony method is used to construct a phylogenetic tree for a set of sequences. Which one of the following statements about the method is CORRECT?

(A)  It predicts the tree that minimizes the steps required to generate the observed variations

(B)  It predicts the tree that maximizes the steps required to generate the observed variations

(C)  It predicts the tree with the least number of branch points

(D)  It employs probability calculations to identify the tree

Answer: (A)

45. Which of the following spectroscopic technique(s) can be used to identify all the functional groups of an antibiotic contaminant in food?

(P) Infrared

(Q) Circular dichroism

(R) Nuclear magnetic resonance

(S) UV-Visible

(A)  P only

(B)  P and R only

(C)  P, Q and R only

(D)  P, Q, R and S

Answer: (B)

46. Adenine can undergo a spontaneous change to hypoxanthine in a cell, leading to a DNA base pair mismatch. The CORRECT combination of enzymes that are involved in repairing this damage is

(A)  Nuclease, DNA polymerase, DNA ligase

(B)  Nuclease, DNA ligase, helicase

(C)  Primase, DNA polymerase, DNA ligase

(D)  Primase, helicase, DNA polymerase

Answer: (A)

47. Consider the ordinary differential equation  If y(1) = 1, the value(s) of y(1.5) , using the Euler’s implicit method [yn+1 = yn + hf(xn+1, yn+1)] with a step size of h =0.5 is (are)

(A)  −1 − 5√0.3

(B)  −1 + 5√0.3

(C)  1 + 5√0.3

(D)  1 – 5√0.3

Answer: (A, B)

48. Which of the following statements are CORRECT for an enzyme entrapped in a spherical particle?

(A)  Effectiveness factor is ratio of the reaction rate with diffusion-limitation to the reaction rate without diffusion-limitation

(B)  Internal diffusion is rate-limiting at low values of Thiele modulus

(C)  Effectiveness factor increases with decrease in Thiele modulus

(D)  Internal diffusion-limitation can be reduced by decreasing the size of the particle

Answer: (A, C, D)

49. Which of the following is(are) COMMON feature(s) for both aerobic and anaerobic bacterial cultures?

(A)  Glycolysis

(B)  NAD+ is the oxidising agent

(C)  Oxidative phosphorylation

(D)  Two net ATP molecules formed per glucose molecule

Answer: (A, B)

50. Which of the following plot(s) is(are) CORRECT for an enzyme that obeys Michaelis-Menten kinetics, assuming [S] << Km ?

[S] is the concentration of the substrate, Km is the Michaelis constant, and v0 is the initial reaction velocity.

Answer: (A, D)

51. Which of the following statement(s) is(are) CORRECT regarding the lac operon in E. coli when grown in the presence of glucose and lactose?

(A)  At low glucose level, the operon is activated

(B)  At high glucose level, the operon is activated to enable the utilization of lactose

(C)  The lac repressor binds to operator region inactivating the operon

(D)  Binding of lactose to the lac repressor induces the operon

Answer: (A, C)

52. Emerging viruses such as SARS-CoV2 cause epidemics. Which of the following process(es) contribute to the rise of such viruses?

(A)  Mutation of existing virus

(B)  Jumping of existing virus from current to new hosts

(C)  Spread of virus in the new host population

(D)  Replication of virus outside a host

Answer: (A, B, C)

53. Introduction of foreign genes into plant cells can be carried out using

(A)  Agrobacterium

(B)  CaCl2 mediated plasmid uptake

(C)  Electroporation

(D)  Gene gun

Answer: (A, C, D)

54. Which of the following statement(s) regarding trafficking in eukaryotic cells is(are) CORRECT?

(A)  Dynamin binds GTP and is involved in vesicle budding

(B)  Dynamin is involved in cytoskeletal remodelling

(C)  Dynein binds ATP and is involved in movement of organelles along microtubules

(D)  Dynein binds GTP and is involved in movement of organelles along microtubules

Answer: (A, C)

55. Consider a random variable X with mean μx = 0.1 and variance σX2 = 0.2 A. A new random variable Y = 2X + 1 is defined. The variance of the random variable Y (rounded off to one decimal place) is ________.

Answer: (0.8 to 0.8)

56. For x1 > 0 and x2 > 0, the value of  is ________.

Answer: (1 to 1)

57. Figure below depicts simplified metabolic and transport reactions taking place in the production of B from A in a cell. The subscript ‘i’ refers to intracellular metabolites. rj is the jth reaction flux in  Under pseudo-steady-state condition, the following reaction fluxes are available.

r1 = 4, r3 = 1 and r6 = 1.

The transport flux of B, r4, is ________  

Answer: (2 to 2)

58. The amount of biomass in a reactor at the end of the batch process is 50 g. Fedbatch operation is initiated by feeding the substrate solution at a constant rate of 1 L h-1. The concentration of substrate in the feed is 50 g L1. The maximum biomass yield  Assuming the system is at quasi-steady state, the maximum amount of biomass after 5 h of feeding is _______ g.

Answer: (150 to 150)

59. An enzyme catalyzes the conversion of substrate A into product B. The rate equation for this reaction is . Substrate A at an initial concentration of 10 mol L-1 enters an ideal mixed flow reactor (MFR) at a flow rate of 10 L min1. The volume of the MFR required for 50% conversion of substrate to product is ________ L.

Answer: (100 to 100)

60. Liquid-phase mass transfer coefficient (kL) is measured in a stirred tank vessel using steady-state method by sparging air. Oxygen uptake by the microorganism is measured. The bulk concentration of O2 is 104 mol L1. Solubility of O2 in water at 25°C is 103 mol L1.

If the oxygen consumption rate is 9×104 mol L1 s1, and interfacial area is 100 m2/m3, the value of kL is __________cm s1.

Answer: (1 to 1)

61. Consider a piston-cylinder assembly shown in the figure below. The walls of the cylinder are insulated. The cylinder contains 1 mole of an ideal gas at 300 K and the piston is held initially at the position z1 using a stopper. After the stopper is removed, the piston suddenly rises against atmospheric pressure (1.013×105 Pa) to the new position z2 where it is held by another stopper.

The heat capacity (Cv) of the gas is 12.5 J mol1 K1. The cross-sectional area of the cylinder is 103 m2. Assume the piston is weightless and frictionless.

If z2 – z1 = 1 m, the final temperature of the gas (rounded off to nearest integer) is _______K.

Answer: (291 to 293)

62. Consider the growth of S. cerevisiae under aerobic condition in a bioreactor and the specific growth rate of yeast is 0.5 h1. The overall reaction of the process is 2C6H12O6 +0.2NH3+10.35O2 → CH8O0.5N0.2+0.2C2H6O+10.6CO2+10.8H2O

The heat of combustion values for different compounds are tabulated below with the reference to CO2, H2O, O2, and N2 at standard conditions.

The specific rate of heat production (rounded off to nearest integer) is ________ kJ mol1 h1.

Answer: (2420 to 2430)

63. A pilot sterilization was carried out in a vessel containing 100 m3 medium with an initial spore concentration of 108 spores/ml. The accepted level of contamination after sterilization is 1 spore in the entire vessel. The specific death rate constant for the spore is 2 min1 at 121° Assuming no death takes place during the heating and cooling cycles, the holding time at 121°C (rounded off to nearest integer) is _______min.

Answer: (17 to 19)

64. A circular plasmid has three different but unique restriction sites for enzymes ‘a’, ‘b’ and ‘c.’ When enzymes ‘a’ and ‘b’ are used together, two fragments of equal size are generated. Enzyme ‘c’ creates fragments of equal size only from one of the fragments generated by those cleaved by ‘a’ and ‘b’. The plasmid is treated with a mixture of ‘a’, ‘b’ and ‘c’ and analysed by agarose gel electrophoresis. The number of bands observed in the gel is _______.

Answer: (2 to 2)

65. A bacterial strain is grown in nutrient medium at 37°C under aerobic conditions. The medium is inoculated with 102 cells from a seed culture. If the number of cells in the culture is 105 after 10 hours of growth, the doubling time of the strain (rounded off to nearest integer) is _______h.

Answer: (1 to 1)

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