CBSE 2026 · Region 2 · Set 1 · Q7 · 1 mark
A bacterium having radioactive thymidine in its DNA is allowed to multiply in a medium having non-radioactive thymidine for two generations. What percentage of bacteria will have radioactive thymidine in its DNA?
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 50$
Molecular Basis of InheritanceReplicationApplymcqmedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.