A-LevelBiologyNucleic acids and protein synthesisMay/June 2018Paper 1 Q251 Mark
Which statements about tRNA are correct? 1 Hydrogen bonds between bases temporarily hold tRNA against mRNA. 2 The base sequences in the tRNA molecules are the same as the base sequences in the mRNA that is being translated. 3 The specificity of the tRNA molecule for glycine and the specificity of the enzyme that loads glycine are both necessary for correct loading.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct Answer
The correct answer is C: 1 and 3 only
📋 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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