Genetic Code and Mutations

00:00 1 marks

11. The table shows the mRNA codons for three amino acids. Which substitution mutation of a base triplet on a DNA strand will lead to the same polypeptide being formed at translation?

Valine	Threonine	Proline
GUU	ACU	CCU
GCC	ACC	CCC
GCA	ACA	CGA
GCG	ACG	CCG

A

TGA to TCA
B

CGT to CTA
C

CAA to CGA
D

GCT to GGA

Hint Hint

Hint

Remember that transcription creates mRNA from a DNA template strand using complementary base pairing (A-U, T-A, C-G, G-C). A mutation that results in a different mRNA codon coding for the same amino acid (due to code degeneracy) will not change the polypeptide.

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Answer Answer

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GCT to GGA

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Answer Explanation Answer Explanation

Examiner Tips Examiner Tips

Common Errors Common Errors

Genetic Code and Mutations

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Genetic Code and Mutations

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