Life Sciences
GATE XL topic:microbial-genetics PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–26 of 26. Imported answers require independent review unless marked reviewed.
Question 17
Open questionXL-SNAT2 marksNeeds review
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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Open questionXL-SNAT2 marksNeeds review
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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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 8
Open questionXL-SMCQ1 markNeeds review
Which one of the following conditions favors maximum expression of lac operon genes in E. coli?
Your answerChoose one option.
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Open questionXL-SMCQ2 marksNeeds review
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.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 69
Open questionXL-SMCQ2 marksNeeds review
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.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 72
Open questionXL-SNAT2 marksNeeds review
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 ______.Log in to check the answer
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