| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.SL.TZ0.16 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 16 | Adapted from | N/A |
Question
The flow chart summarizes methods of gene transfer.
Which enzymes are used in steps I and II?
Markscheme
B
Examiners report
This question on gene transfer was also a good discriminator as the stronger candidates correctly choose B, indicating that they knew both enzymes involved in the steps indicated while the weaker candidates were split between C and D showing that they knew one, but not both of the enzymes.
Syllabus sections
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