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Biology · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 1 · Q23
Draw a labelled diagram of a 'replicating fork' showing the polarity. Why does DNA replication occur within such 'fork'?
Draw a labelled diagram of a 'replicating fork' showing the polarity. Why does DNA replication occur within such 'fork'?
Marking-scheme solution
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• Replication of DNA occurs in small replication fork because DNA being a long
molecule separation of the two strands along its entire length requires a very high amount of energy.
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.