| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ2.34 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 34 | Adapted from | N/A |
Question
Which of the following statements is true about enzymes?
A. They are used up in the reactions they catalyse.
B. Allosteric inhibitors bind to the active site.
C. They lower the energy of activation for a reaction.
D. They supply the energy of activation for a reaction.
Markscheme
C
Examiners report
This question seemed to be easy, but was also a good discriminator.
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