Explain6 marksChallenge
Two DNA samples, A and B, are isolated from different organisms. Sample A contains 60% C-G base pairs, while sample B contains 40% C-G base pairs. Explain why sample A requires a higher temperature to denature than sample B.
CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
Nucleic acids and protein synthesis: explain question
How this question is marked
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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