A-LevelBiologyBiological molecules9700/12 · Feb/Mar 2017 · Q111 Mark

Haemoglobin consists of two α chains and two β chains. Approximately 5% of all humans have one amino acid in the β chain that has been changed, affecting the structure and stability of haemoglobin. Which of the levels of protein structure could be changed in the haemoglobin of these humans?

Aprimary only

Bprimary and quaternary only

Cprimary, secondary, tertiary and quaternary

Dsecondary, tertiary and quaternary only

✓ Correct answer

C: primary, secondary, tertiary and quaternary

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2017 Paper 1 Variant 2, question 11.

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