A-LevelBiologyBiological molecules9700/12 · May/June 2011 · Q101 Mark

The diagram shows the structure of the amino acid cysteine. [Figure: Chemical structure of cysteine] When two of these amino acids join together what bond(s) are formed?

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Adisulfide bonds only

Bdisulfide and peptide bonds

Chydrogen, disulfide and peptide bonds

Dpeptide bonds only

✓ Correct answer

D: peptide bonds only

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 10.

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