A-LevelBiologyBiological moleculesFeb/Mar 2017Paper 1 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
The correct answer is C. 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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