Life Sciences
2025 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XL 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 76–78 of 122. Imported answers require review unless explicitly marked reviewed.
Question 76
Open questionXL-SMCQ2 marksNeeds review
Correctly match the viruses listed in Column I with the nature of their corresponding genetic materials listed in Column II.
Column I | Column II
P. Bacteriophage lambda | i. dsDNA
Q. Bacteriophage M13 | ii. ssDNA
R. Coronavirus | iii. ssRNA
S. Reovirus | iv. dsRNA
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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 77
Open questionXL-SMCQ2 marksNeeds review
A culture of lac
Escherichia coli is grown in a medium lacking lactose or any other β-galactoside. The response of the lac operon upon induction by lactose can be monitored by measuring the levels of lac mRNA, β-galactosidase enzyme and permease enzyme. Which one of the following profiles correctly captures the on-off response to lactose? 
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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 78
Open questionXL-SMSQ2 marksNeeds review
Which option(s) correctly match(es) the structures in a bacterial cell (Column I) with their corresponding functions (Column II).
Column I | Column II
P. Cell wall | i. Protection from osmotic stress
Q. Fimbriae | ii. Attachment to surfaces
R. Flagella | iii. Motility
S. Pili | iv. Transfer of genetic material
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