| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.HL.TZ1.27 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 27 | Adapted from | N/A |
Question
What are Okazaki fragments?
A. Short lengths of RNA primase attached to the DNA during replication
B. Short sections of DNA formed during DNA replication
C. Nucleotides added by DNA polymerase I in the same direction as the replication fork
D. Sections of RNA removed by DNA polymerase III and replaced with DNA
Markscheme
B
Examiners report
This question was a good discriminator. Some candidates confused primase with primer and thus chose the incorrect response. Okazaki fragments are expected knowledge as per AS 7.2.2.
