A-LevelBiologyEnzymesOct/Nov 2025Paper 1 Q91 Mark
Enzyme P has been found in a tropical grass. • The enzyme catalyses the hydrolysis of the fungal polysaccharide, chitin, into amino sugars. • It also inhibits the activity of an enzyme in locust guts which catalyses the digestion of amylose. Which row describes the actions of enzyme P?
Areaction catalysed: hydrolysis of glycosidic bonds, reaction inhibited: condensation of glycosidic bonds
Breaction catalysed: hydrolysis of glycosidic bonds, reaction inhibited: hydrolysis of glycosidic bonds
Creaction catalysed: hydrolysis of peptide bonds, reaction inhibited: condensation of glycosidic bonds
Dreaction catalysed: hydrolysis of peptide bonds, reaction inhibited: hydrolysis of glycosidic bonds
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of enzymes 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep