GATE XL Microbial Genetics PYQs & Answers — Page 3

Questions 21–26 of 26. Imported answers require independent review unless marked reviewed.

The genome of a bacterium encodes for 10 different surface antigens, whose expression can be turned ‘ON’ or ‘OFF’ randomly and independently. The number of possible antigenic combinations is __________.

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Suppose the mRNAs in a newly discovered bacteria are composed of only two distinct nucleotides (as opposed to four found in all known organisms). Considering that the organism has no nucleotide modification systems, the number of nucleotides required per codon to encode at least 20 distinct amino acids will be __________.

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Which one of the following conditions favors maximum expression of lac operon genes in E. coli?

Your answerChoose one option.

Glucose-low, lactose-low, cAMP-high

Glucose-high, lactose-low, cAMP-high

Glucose-low, lactose-high, cAMP-high

Glucose-high, lactose-high, cAMP-low

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Which of the following processes are involved in horizontal gene transfer (HGT)? (i) Conjugation (ii) Transduction (iii) Binary fission (iv) Transformation (v) Translation synthesis (vi) Transversion

Your answerChoose one option.

(i), (ii), (iv)

(i), (iv), (vi)

(ii), (iv), (v)

(i), (ii), (iv)

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Match the enzymes given in Group I with the events from Group II.

Group I (P) UvrABC endonuclease (Q) Reverse transcriptase (R) AP endonuclease (S) ATP sulfurylase

Group II (I) Retrovirus replication (II) Base excision repair (III) Nucleotide excision repair (IV) Pyrosequencing

Your answerChoose one option.

P-II, Q-I, R-IV, S-III

P-III, Q-I, R-II, S-IV

P-IV, Q-III, R-I, S-II

P-II, Q-I, R-III, S-IV

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The transformation efficiency of competent cells prepared in a laboratory is

CFU/μg of plasmid DNA. If 0.01 μg of this plasmid is used to transform these competent cells, the number of transformed bacteria in CFU after plating will be ______.

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GATE XL Microbial Genetics PYQs

Question 17

Question 18

Question 8

Question 16

Question 69

Question 72