A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2022 · Q111 Mark

Silk moth caterpillars have been genetically modified to produce a mixture of their own silk and the much stronger spider silk of the golden orb web spider. The spider silk polypeptide chain has many repeated sequences of two amino acids, glycine and alanine, arranged in a crystalline structure. [Diagram] What correctly describes the structure of spider silk?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Aprimary protein structure with regions of α-helices

Bsecondary protein structure with regions of β-pleated sheets

Ctertiary protein structure with regions of α-helices

Dquaternary protein structure with regions of β-pleated sheets

✓ Correct answer

B: secondary protein structure with regions of β-pleated sheets

Oracle Prep sorts past-paper questions by topic, so you can drill Biological molecules and see which topics are most likely to come up next.

Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2022 Paper 1 Variant 2, question 11.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content