A-LevelBiologyBiological molecules9700/12 · May/June 2017 · Q51 Mark

Boiling the bones and teeth from dead animals can be used to produce a type of glue. The glue is formed from the collagen fibres present in bones and teeth. Which statement describes the changes to collagen that occur when the glue is produced?

AThe fibres of collagen become more coiled.

BThe fibres of collagen become more flexible.

CThe helices of collagen molecules unwind.

DThe molecules of collagen dissolve in water.

✓ Correct answer

C: The helices of collagen molecules unwind.

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2017 Paper 1 Variant 2, question 5.

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