| Date | November 2009 | Marks available | 1 | Reference code | 09N.1.HL.TZ0.7 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 7 | Adapted from | N/A |
Question
What principle is necessary to prevent mutation of DNA during replication?
A. Base pairing is complementary.
B. One gene codes for one polypeptide.
C. Substrates are specific to enzymes.
D. The genetic code is universal.
Markscheme
A
Examiners report
This question was well answered by most of the candidates, especially the better ones. It would have been better to say that base pairing preserves the sequence rather than prevents mutation of DNA.
Syllabus sections
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