A-LevelBiologyNucleic acids and protein synthesisMay/June 2019Paper 1 Q181 Mark

Which statement correctly describes the base pairing in a molecule of DNA?

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.

AThe purine adenine forms bonds with the pyrimidine thymine.

BThe purine adenine forms bonds with the pyrimidine uracil.

CThe purine cytosine forms bonds with the pyrimidine guanine.

DThe purine guanine forms bonds with the pyrimidine thymine.

✓ Correct Answer

The correct answer is A: The purine adenine forms bonds with the pyrimidine thymine.

📋 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 2019 examination, Paper 1 Variant 2.

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