DP Biology (first assessment 2025)

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Question SPM.2.HL.TZ0.10a

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Date May Specimen-2023 Marks available [Maximum mark: 4] Reference code SPM.2.HL.TZ0.10a
Level HL Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 4]
SPM.2.HL.TZ0.10a
(a)

Outline the role of UV radiation as a mutagen.

[4]

Markscheme
  1.  affects/damages/causes change in oncogenes/errors in DNA repair;
  2.  UV radiation might alter complementary base pairing/break hydrogen bonds/fuse bases;
  3.  double helix may uncoil;
  4.  strands may separate/break;
  5.  DNA sequence may be altered/DNA bases may re-connect to different bases after separating;
  6.  DNA strand may break into pieces / fragments of DNA may be lost;

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