CAIE A Level Biology 9700 · Biological molecules

Biological molecules: outline question

Outline5 marksStandard

A student is using the biuret test to identify whether three unknown solutions contain protein. The student also sets up a positive control and a negative control. Outline the purpose of each control and state the expected result for each.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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