CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
A DNA nucleotide that contains the base adenine is shown below. (Structural formulae are not required.)
Explain two similarities and two differences between the structure of this DNA nucleotide and the structure of an ATP molecule.
4 marks, so the mark scheme is looking for about 4 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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