A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2025 · Q241 Mark
The flow diagram shows some of the stages in the replication of a lagging strand of DNA. [Flow diagram: 'The DNA double helix begins to unwind.' -> 'The single strands of DNA are exposed.' -> 'New complementary DNA fragments are synthesised in the 5' to 3' direction.' -> 'The fragments of newly formed DNA are linked together.'] Which stage of DNA replication uses the enzyme DNA ligase?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe DNA double helix begins to unwind.
BThe single strands of DNA are exposed.
CNew complementary DNA fragments are synthesised in the 5' to 3' direction.
DThe fragments of newly formed DNA are linked together.
✓ Correct answer
D: The fragments of newly formed DNA are linked together.
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