A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2010 · Q91 Mark

An amino acid can be represented as [Figure 9.1 showing a central carbon atom bonded to N, H, C(=O)OH, and R] where R represents a variable side chain. Which is not a possible side chain?

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ACH3

BCH2CH2SCH3

CCH2COΝΗ2

DHOCH2CH(OH)CH2OH

✓ Correct answer

D: HOCH2CH(OH)CH2OH

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2010 Paper 1 Variant 2, question 9.

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