| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ1.19 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
Which enzymes are needed to produce recombinant plasmids to be used in gene transfer?
A. DNA polymerase and DNA ligase
B. DNA polymerase and restriction enzyme (endonuclease)
C. Transcriptase and RNA polymerase
D. Restriction enzyme (endonuclease) and DNA ligase
Markscheme
D
Examiners report
Although this question discriminated well, many candidates chose responses A and B instead of the correct D. It would imply that perhaps many are confusing DNA replication with DNA recombination.
Syllabus sections
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