CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
During the S phase of the cell cycle, DNA replication occurs. Describe why one daughter strand (the leading strand) is synthesised continuously while the other (the lagging strand) is synthesised in short fragments. In your answer, include the roles of DNA polymerase and DNA ligase.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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