A-LevelBiologyNucleic acids and protein synthesis9700/12 · Feb/Mar 2017 · Q241 Mark
Which statement about nitrogenous bases is correct?
AAdenine is a pyrimidine with a double ring structure.
BCytosine is a purine with a double ring structure.
CGuanine is a purine with a single ring structure.
DUracil is a pyrimidine with a single ring structure.
✓ Correct answer
D: Uracil is a pyrimidine with a single ring structure.
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