Topic: DNA replication and central dogma· Genetics and Evolution

During DNA replication, Okazaki fragments are used to elongate :

1. The lagging strand towards replication fork.

2. The leading strand away from replication fork.

3. The lagging strand away from the replication fork.

4. The leading strand towards replication fork.

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 3. The lagging strand away from the replication fork.

Key idea: DNA polymerase can add nucleotides only in the 5' to 3' direction.

On the leading strand, synthesis is continuous toward the fork. On the lagging strand the template is read the other way, so DNA is made in short pieces (Okazaki fragments), each synthesised away from the replication fork and later joined by DNA ligase. So Okazaki fragments elongate the lagging strand away from the fork. Answer: (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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During DNA replication, Okazaki fragments are used to elongate :

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