A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2025Paper 1 Q271 Mark
The diagram shows protein synthesis in a prokaryote. [Diagram of protein synthesis in a prokaryote showing DNA, cell wall, X, Y, tRNA 1, tRNA 2, mRNA sequence AUG-CCU-AAG-UUG-CCC] Which row is correct for molecule X, structure Y and the anticodon of tRNA 1?
Amolecule X: amino acid, structure Y: 80S ribosome, anticodon of tRNA 1: AAC
Bmolecule X: polypeptide, structure Y: 80S ribosome, anticodon of tRNA 1: UUG
Cmolecule X: polypeptide, structure Y: 70S ribosome, anticodon of tRNA 1: AAC
Dmolecule X: protein, structure Y: 70S ribosome, anticodon of tRNA 1: UUG
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of nucleic acids and protein synthesis within the Biologysyllabus. The examiner's mark scheme requires...
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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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