O-LevelBiologyEcology & Environment5090/11 · May/June 2011 · Q291 Mark

The diagram shows part of the nitrogen cycle. Which substance at X forms part of this cycle?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Acellulose

Bfat

Cprotein

Dstarch

✓ Correct answer

C: protein

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2011 Paper 1 Variant 1, question 29.

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