A-LevelBiologyBiological molecules9700/12 · May/June 2011 · Q91 Mark

Myoglobin is a protein with a similar function to haemoglobin. However, myoglobin does not have a quaternary structure. Why does myoglobin not have a quaternary structure?

AMyoglobin does not contain a haem group.

BMyoglobin does not contain any alpha helices.

CMyoglobin has a fibrous rather than a globular structure.

DMyoglobin has only one polypeptide chain.

✓ Correct answer

D: Myoglobin has only one polypeptide chain.

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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 9.

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