GATE XL 2023 Paper 1 — page 25

Questions 73–75 of 122. Imported answers require review unless explicitly marked reviewed.

Which one of the following statements about batch culture of microbes is NOT correct?

Your answerChoose one option.

Cells from stationary phase will show longer lag phase when inoculated in fresh growth medium compared to those collected from exponential phase.

Death phase of culture is often exponential in nature.

Stationary phase is the critic growth phase.

The rate of generation of new cells during exponential growth phase is constant.

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Match the test in Group I with its application in Group II

Group I

P. Oakley-Fulthorpe test

Q. Limulus amoebocyte lysate test

R. Weil-Felix reaction test

S. Complement-fixation test

Group II

IgM detection

Determining antigen-antibody specificity

Endotoxin detection

Rickettsial infection diagnosis

Your answerChoose one option.

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

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

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

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

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Which one of the following is NOT correct about antibiotic resistance mechanism in microbes?

Your answerChoose one option.

Mycoplasma is naturally resistant to penicillins due to presence of R plasmid.

Gram-negative bacteria are impermeable to penicillin G.

β-lactamases of bacteria can cleave penicillins.

Selective microbes can efflux penicillins entering the cell and develop resistance.

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2023 · Paper 1