A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2019Paper 1 Q231 Mark
What is correct for uracil?
AIt has a single ring structure: ✓, It is a purine: ✓, It joins its complementary base with 2 hydrogen bonds: ✓
BIt has a single ring structure: ✓, It is a purine: x, It joins its complementary base with 2 hydrogen bonds: ✓
CIt has a single ring structure: x, It is a purine: ✓, It joins its complementary base with 2 hydrogen bonds: x
DIt has a single ring structure: x, It is a purine: x, It joins its complementary base with 2 hydrogen bonds: ✓
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of nucleic acids and protein synthesis within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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