CAIE A Level Biology 9700 · Biological molecules

Biological molecules: compare question

Compare4 marksStandard

A researcher is studying two proteins from a mammal: haemoglobin and collagen. Both have quaternary structure but differ in many ways.

Compare the structure and function of haemoglobin and collagen with reference to their quaternary structure.

How this question is marked

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.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

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