| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ1.19 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
Which of the following parts of the digestive system secrete proteases?
Markscheme
C
Examiners report
Although proteases are not secreted in the small intestine, many years ago it was believed that they were. Proteases are membrane bound in the small intestine (but not secreted there). Considering that some books might still use this concept, both answers A and C were considered as correct in order to make this question fair.
Syllabus sections
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