| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.HL.TZ1.35 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 35 | Adapted from | N/A |
Question
Which of the following statements is incorrect?
A. Active immunity is the stimulation of the immune system to produce antigen-specific antibodies.
B. Vaccines produce immunological memory similar to that acquired by having the natural disease.
C. The most common way to acquire passive immunity is to have the natural disease.
D. Killed forms of a microorganism can act as an antigen.
Markscheme
C
Examiners report
This question was a good discriminator which the less able candidates found difficult.
