Explain6 marksChallenge
A scientist is using PCR to amplify a 500 base pair fragment from a sample of ancient mammoth DNA.
Explain the steps that occur during one cycle of PCR and the role of Taq DNA polymerase in this process.
CAIE A Level Biology 9700 · Genetic technology
Genetic technology: 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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