A-LevelBiologyBiological moleculesOct/Nov 2025Paper 1 Q111 Mark
Resilin is a protein found in the wings of insects. It is an elastic, fibrous protein and scientists have suggested that it may have an important role in allowing the wings of an insect to fold and unfold without damage. Peptidyl transferase is an enzyme which catalyses the condensation of amino acids during translation to form resilin. Which statements are correct? 1 Peptidyl transferase and resilin have structural roles in the insect. 2 Peptidyl transferase is a globular protein. 3 Peptidyl transferase is soluble in water.
A1 and 2
B1 and 3
C1 only
D2 and 3
✓ Correct Answer
The correct answer is D: 2 and 3
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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