| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.HL.TZ0.11 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 11 | Adapted from | N/A |
Question
A base substitution in a gene has changed a codon. Which of these consequences could result from a base substitution in a codon?
I. Another amino acid will be incorporated in the protein
II. A stop codon is generated
III. The same protein will be synthesized
A. I only
B. I and II only
C. I and III only
D. I, II and III
Markscheme
D
Examiners report
A multi-part question which proved to be a very good discriminator, with just over one third giving the correct answer of D. The crucial expression in the question is ‘could result’ and many went for A as option I was the most obvious.
Syllabus sections
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