| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ1.24 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 24 | Adapted from | N/A |
Question
The antisense strand on the DNA molecule coding for three codons of a gene is
TATCGCACG
What are the anticodons of the three tRNA molecules that correspond to this sequence?
A. UAU, CGC and ACG
B. ATA, GCG and TGC
C. AUA, GCG and UGC
D. TAT, CGC and ACG
Markscheme
A
Examiners report
Most candidates had the incorrect answer C, showing poor understanding of the process of translation. It was a good discriminator, so good candidates did understand this question.
