A-LevelBiologyNucleic acids and protein synthesisMay/June 2016Paper 1 Q191 Mark

Which statements about complementary base pairing are correct? 1 Cytosine forms three hydrogen bonds with guanine. 2 Purines and pyrimidines are different sizes. 3 It allows transcription to occur. 4 The base pairs are of different lengths.

Q: What is the correct answer to this A-Level Biology question?

The correct answer is A: 1, 2 and 3.

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.

A1, 2 and 3

B1, 2 and 4

C1, 3 and 4

D2, 3 and 4

✓ Correct Answer

The correct answer is A: 1, 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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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 May/June 2016 examination, Paper 1 Variant 2.

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