| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ2.25 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 25 | Adapted from | N/A |
Question
What is the distinction between highly repetitive DNA sequences and single-copy genes?
A. The highly repetitive sequences have greater amounts of guanine.
B. The highly repetitive sequences have greater amounts of cytosine.
C. The highly repetitive sequences are not transcribed.
D. The highly repetitive sequences are not replicated.
Markscheme
D
Examiners report
Almost 84% of the candidates recognized that highly repetitive DNA sequences are not transcribed.
