CAIE A Level Biology 9700 · Biological molecules

Biological molecules: compare question

Compare4 marksStandard

A student is comparing two triglycerides isolated from different sources.

Triglyceride A: All fatty acid tails are saturated, meaning every carbon–carbon bond in the hydrocarbon chains is a single bond. This triglyceride is obtained from animal fat and is solid at room temperature.

Triglyceride B: Some fatty acid tails are unsaturated, containing one or more carbon–carbon double bonds. This triglyceride is obtained from plant oil and is liquid at room temperature.

Compare the structure of these two triglycerides and explain how the structural differences affect their physical properties and functions.

0 words · 4 marks

No account needed for your first marks. Your answer is used only to mark it.

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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