DP Biology (first assessment 2025)

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Question SPM.1A.HL.TZ0.11

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.11
Level HL Paper 1A Time zone TZ0
Command term Question number 11 Adapted from N/A
11.
[Maximum mark: 1]
SPM.1A.HL.TZ0.11

The table shows the mRNA codons for three amino acids.

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

Which substitution mutation of a base triplet on a DNA strand will lead to the same polypeptide being formed at translation?


A.  TGA to TCA

B.  CGT to CTA

C.  CAA to CGA

D.  GCT to GGA

[1]

Markscheme

D

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