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DNA Replication · Paper 1 — Free Biology SL Practice Questions

1FoundationMCQDNA structure and replication mechanism1 markPaper 1~2 min

In the Meselson–Stahl experiment, E. coli were grown in

^{15}

N medium, then transferred to

^{14}

N medium for exactly one generation. DNA was extracted analysed by density-gradient centrifugation, producing a single band at an intermediate density. Which mechanism of DNA replication is consistent with this result?

Solutions

2MasteryMCQDNA structure and replication mechanism1 markPaper 1~2 min

In the Meselson–Stahl experiment, E. coli were grown in

^{15}

N medium until all DNA was fully labelled, then transferred to

^{14}

N medium. After two rounds of replication, the DNA was centrifuged in a caesium chloride density gradient. Which result, and which replication model, are correctly paired?

Solutions

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