A-LevelBiologyNucleic acids and protein synthesisMay/June 2023Paper 1 Q251 Mark
The DNA triplets of genes are translated as amino acids or stop signals during protein synthesis. The table shows some of these triplets. [Figure 25.1] What could be the effects of one substitution mutation in a triplet coding for tyrosine? 1 The triplet is translated as cysteine. 2 The triplet is translated as tryptophan. 3 The triplet is translated as tyrosine. 4 Translation stops at this triplet.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
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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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