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 70–72 of 122. Imported answers require review unless explicitly marked reviewed.
Question 70
Open questionXL-SMCQ1 markNeeds review
A penicillin sensitive Escherichia coli population is exposed to a lethal dose (200 μg/ml) of penicillin. Assuming density-independent mortality, which one of the following relationships would describe the number of surviving bacteria (N) over time (T)?
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A bacterium obtains energy from a chemical source by the oxidation of reduced
, with
as the principal carbon source. Which one of the following nutritional groups does this bacterium belong to?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-SMCQ1 markNeeds review
The origin of the Escherichia coli chromosome on the genetic map is shown below.
Bidirectional replication is a feature of this system and both replication forks move at the same rate. Which one of the following sequences of replication of the genes is correct?
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