| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.SL.TZ2.28 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | State | Question number | 28 | Adapted from | N/A |
Question
What is an effect of the HIV virus on the immune system?
A. Reduction of the number of phagocytes
B. Reduction of the number of lymphocytes
C. Increase in the ability to form antibodies
D. Decrease in the ability to produce antigens
Markscheme
B
Examiners report
Most candidates mentioned the reduction in the number of lymphocytes as a cause of HIV, but many believed that it was the reduction in the production of antigens. Probably the confusion was with the words antibodies and antigens.
