A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2015 · Q101 Mark

The diagrams show the amino acid serine. Which circled area is different in all other amino acids?

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.

AThe amino group (NH)

BThe carboxyl group (COOH)

CThe R group (-CH₂OH)

DThe hydrogen atom on the alpha carbon (H)

✓ Correct answer

C: The R group (-CH₂OH)

Oracle Prep sorts past-paper questions by topic, so you can drill Biological molecules and see which topics are most likely to come up next.

Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2015 Paper 1 Variant 2, question 10.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content