A-LevelBiologyBiological moleculesOct/Nov 2022Paper 1 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?
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
The correct answer is B. This question tests the candidate's understanding of biological molecules within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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