A-LevelBiologyNucleic acids and protein synthesisMay/June 2020Paper 1 Q241 Mark
Part of the nucleotide sequence of an mRNA molecule is shown, with spaces between the codons. CAG UAC AGC AAU CUA UAA The translation of the codons is provided. [Figure 24.1] Which events will cause the termination of polypeptide synthesis during translation? 1 Deletion of C from the leu codon. 2 Deletion of C from the tyr codon. 3 The ribosome reaching the UAA codon.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
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The correct answer is D. 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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