A-LevelBiologyBiological moleculesOct/Nov 2017Paper 1 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
The correct answer is B. This question tests the candidate's understanding of biological molecules within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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