A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2011 · Q71 Mark

High concentrations of urea break all bonds, except covalent bonds, in protein molecules. Which level of protein structure would remain unchanged when a protein is treated with urea?

Aprimary

Bsecondary

Ctertiary

Dquaternary

✓ Correct answer

A: primary

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2011 Paper 1 Variant 2, question 7.

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