A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2017 · Q121 Mark

A polypeptide has a number of amino acids (n). How many peptide bonds and R groups (side chains) does this polypeptide have?

An - 1 peptide bonds and n – 1 R groups

Bn - 1 peptide bonds and n R groups

Cn peptide bonds and n − 1 R groups

Dn peptide bonds and n R groups

✓ Correct answer

B: n - 1 peptide bonds and n R groups

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2017 Paper 1 Variant 2, question 12.

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