A-LevelBiologyNucleic acids and protein synthesisFeb/Mar 2017Paper 1 Q271 Mark

The diagram shows the stages in the production of part of a polypeptide. Which feature of the triplet code is illustrated by the information given? [Figure 27.1]

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.

AAn amino acid can be coded for by more than one triplet.

BThe triplet code is non-overlapping and is only read in one direction.

CThe triplet code is universal for the DNA of all organisms.

DThere are some triplets that code for 'start' and 'stop'.

✓ Correct Answer

The correct answer is A: An amino acid can be coded for by more than one triplet.

📋 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 Feb/Mar 2017 examination, Paper 1 Variant 2.

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