GATE XL purpose:exam-prep PYQs & Answers — Page 82

Questions 811–820 of 1235. Imported answers require independent review unless marked reviewed.

Digestion of an immunoglobulin G (IgG) molecule with pepsin will NOT

Your answerChoose one option.

generate a bivalent antigen binding fragment

generate monovalent antigen binding fragments

destroy the complement binding site

cleave the heavy chain of IgG molecule

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Match the process involved in nitrogen or sulfur cycle in Group I with the corresponding microbe in Group II.

Group I P. Denitrification Q. Nitrogen fixation by free-living microbe R. Oxidation of H₂S to sulfur S. Nitrogen fixation by a symbiotic microbe

Group II

Azotobacter

Beggiatoa

Pseudomonas

Rhizobium

Your answerChoose one option.

P-2, Q-3, R-4, S-1

P-2, Q-1, R-3, S-4

P-3, Q-4, R-1, S-2

P-3, Q-1, R-2, S-4

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: Diphtheria exotoxin is an example of A-B type toxin.

Reason [r]: The A component of the toxin is released from the host cell while the B component inhibits protein synthesis and kills the host cell.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

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Which one of the following statements about control of microbial growth is NOT correct?

Your answerChoose one option.

Nonionizing radiation leads to thymine dimers formation in DNA

Spores and mycoplasma can pass through membrane filters (0.22-0.45 μm)

Use of high concentration of salts and sugars to preserve food is a chemical method of microbial control

Thermoduric bacteria can survive pasteurization

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An example of a differential and selective medium in which colonies of Gram-negative bacteria produce large amounts of acidic products and appear green with a metallic sheen is

Your answerChoose one option.

Blood agar

EMB agar

MacConkey agar

Mannitol salt agar

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Which one of the following is an example of substrate level phosphorylation?

Your answerChoose one option.

Glucose to Glucose 6-phosphate

Fructose 6-phosphate to Fructose 1,6-bisphosphate

1,3-bisphosphoglycerate to 3-phosphoglycerate

2-phosphoglycerate to Phosphoenolpyruvate

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A bacterial culture containing

live cells was exposed to a newly developed sterilizing agent. After 30 minutes of exposure, 3 live cells remained in culture. The decimal reduction time (in minutes) for the new agent is _____.

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A bacterial culture has a generation time of 34 minutes. The time taken (in minutes, rounded off to two decimal places) for the OD₅₀ of this exponentially growing culture to increase from 0.25 to 0.85 is _____.

Assume that OD₅₀ has a linear relationship with the cell density.

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A 100 μl aliquot (

dilution) of the bacterial culture plated on the nutrient agar gave 4 colonies. The bacterial stock concentration (in million cells/ml, rounded off to one decimal place) is _____.

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A continuous bacterial culture carried out in a chemostat is set to a flow rate of 40 ml/hr. The culture volume is equivalent to that of a cubical container having 10 cm sides. The dilution rate (in hr⁻¹, rounded off to two decimal places) of this system is _____.

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GATE XL purpose:exam-prep PYQs

Question 11

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Question 20