A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2009 · Q121 Mark

HIV-1 protease is an enzyme produced by the HIV virus. Two identical chains of 99 amino acids form the enzyme. In each chain, amino acids 25, 26 and 27 in the sequence form part of the active site. Which orders of protein structure control the shape of the active site?

Aprimary, secondary, tertiary and quaternary

Bprimary, secondary and tertiary only

Cprimary and quaternary only

Dquaternary only

✓ Correct answer

A: 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, Oct/Nov 2009 Paper 1 Variant 2, question 12.

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