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A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2019 · Q221 Mark

The RNA triplet UAG acts as a stop codon terminating the synthesis of a polypeptide. The diagram shows a strand of DNA which codes for four amino acids. Where would an insertion mutation of a thymine nucleotide result in the termination of translation? [Figure 22.1]

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AA
BB
CC
DD

✓ Correct answer

B: B

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Topic
Nucleic acids and protein synthesis, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, Oct/Nov 2019 Paper 1 Variant 2, question 22.

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