| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.HL.TZ1.20 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Identify | Question number | 20 | Adapted from | N/A |
Question
What effect does HIV have on the immune system?
A. It prevents leucocytes from fighting bacteria by phagocytosis.
B. It causes excessive production of leucocytes in bone marrow.
C. It destroys antibodies produced by leucocytes.
D. It lowers the number of leucocytes, reducing antibody production.
Markscheme
D
Examiners report
N/A
Syllabus sections
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