GATE XL branch:xl PYQs & Answers — Page 8

Questions 71–80 of 1235. Imported answers require independent review unless marked reviewed.

Topic practice 1235 questionsPage 8 of 124

Which one of the following drugs is a viral protease inhibitor?

Your answerChoose one option.

Acyclovir

Nevirapine

Ritonavir

Zidovudine

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In Escherichia coli, the minimum number of crossovers required between F⁻ genome and the linear DNA transmitted by Hfr to form a viable recombinant is _____. (Answer in integer)

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The decimal reduction time of Escherichia coli at a particular temperature is one minute. Assuming no bacterial growth and constant death rate, the time required for one million bacteria to get reduced to one viable bacterium is ____ minutes. (Answer in integer)

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Which one of the following options correctly matches the microbial names in Column I with their corresponding sources of epithet in Column II?

Column I Column II

(P) Klebsiella pneumoniae (i) causes spor in mice (Q) Penicillium chrysogenum (ii) forms pus (R) Salmonella typhimurium (iii) the disease it causes (S) Streptococcus pyogenes (iv) produces a yellow pigment

Your answerChoose one option.

P-i; Q-ii; R-iii; S-iv

Q-i; R-ii; S-iii; P-iv

R-i; S-ii; P-iii; Q-iv

S-i; Q-ii; P-iii; R-iv

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

Assertion [a]: Silver and copper display bacteriocidal or antiseptic activity.

Reason [r]: Silver and copper effectively demonstrate oligodynamic action.

Your answerChoose one option.

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

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

Both [a] and [r] are false.

[a] is true but [r] is false.

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When tryptophan level is low in Escherichia coli, the expression of tryptophan biosynthesis genes is turned on through an antiterminator stem-loop formation between

Your answerChoose one option.

regions 1 and 2 of the leader sequence (trpL) of mRNA.

regions 2 and 3 of the leader sequence (trpL) of mRNA.

regions 2 and 4 of the leader sequence (trpL) of mRNA.

regions 3 and 4 of the leader sequence (trpL) of mRNA.

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The effect of mutations in a gene at their transcriptional and translational levels were analyzed using Northern (N) and Western (W) blot techniques, respectively. The following figure shows the schematic representation of mRNA and protein expression profiles of the wild-type and its four different mutants. Which one of the following mutants contains mutation in the upstream regulatory region of the gene?

Your answerChoose one option.

Mutant-1

Mutant-2

Mutant-3

Mutant-4

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Which one of the following leucocytes is the most abundant in a healthy human?

Your answerChoose one option.

Basophils

Eosinophils

Monocytes

Neutrophils

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DNA amplification in the polymerase chain reaction is

Your answerChoose one option.

linear.

parabolic.

sigmoidal.

exponential.

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In bacteriophage lambda (λ) life cycle, binding of Cro protein to cI gene operator region

Your answerSelect all correct options. You can choose more than one.

activates cI gene expression.

directs towards the lysogenic state.

directs towards the lytic cycle.

prevents cI gene expression.

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GATE XL branch:xl PYQs

Question 71

Question 72

Question 73

Question 74

Question 75

Question 76

Question 77

Question 78

Question 79

Question 80