A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2015Paper 1 Q211 Mark

Ricin is a toxic protein which inactivates ribosomes. Which effect will this have on protein synthesis?

Q: What topic does this question test?

This question tests Nucleic acids and protein synthesis in A-Level Biology (syllabus code 9700). It is worth 1 mark.

AAmino acids will be unable to bind to the binding sites on specific tRNA molecules.

BAnticodons on mRNA molecules will not base pair to codons on tRNA molecules.

CPeptide bonds will not form between adjacent amino acids in the growing polypeptide.

DRNA nucleotides will be unable to join by condensation reactions to form rRNA.

✓ Correct Answer

The correct answer is C: Peptide bonds will not form between adjacent amino acids in the growing polypeptide.

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Nucleic acids and protein synthesis in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2015 examination, Paper 1 Variant 2.

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