DP Biology (first assessment 2025)

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Question 22N.2.SL.TZ0.4d

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.SL.TZ0.4d
Level SL Paper 2 Time zone TZ0
Command term Explain Question number d Adapted from N/A
d.
[Maximum mark: 2]
22N.2.SL.TZ0.4d
(d)

Explain how a single base substitution mutation in DNA can cause a change to a protein.

[2]

Markscheme
  1. sequence of DNA bases determines the amino acid sequence of a protein;
  2. changing one base (on the DNA) can cause the triplet /mRNA to code for a different amino acid;
  3. changing one base (on the DNA) causes a different protein to be made (during translation);

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