A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2018 · Q121 Mark

The protein glutenin gives bread dough its elasticity. The diagram represents a polypeptide of glutenin. What describes the structure of glutenin?

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Aquaternary structure because there are both globular and fibrous regions

Bquaternary structure because there are both spiral and tightly coiled regions

Csecondary structure because the loose spiral is an α-helix

Dtertiary structure because the different regions form a 3D shape

✓ Correct answer

D: tertiary structure because the different regions form a 3D shape

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 12.

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