A-LevelBiologyNucleic acids and protein synthesis9700/12 · May/June 2021 · Q211 Mark
The diagram shows a strand of DNA and mRNA during transcription. [Figure 21.1] Which row correctly identifies 1, 2 and 3?
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A1: purine, 2: deoxyribose, 3: two hydrogen bonds
B1: purine, 2: ribose, 3: three hydrogen bonds
C1: pyrimidine, 2: deoxyribose, 3: two hydrogen bonds
D1: pyrimidine, 2: ribose, 3: three hydrogen bonds
✓ Correct answer
D: 1: pyrimidine, 2: ribose, 3: three hydrogen bonds
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