| Date | May 2017 | Marks available | 1 | Reference code | 17M.1.HL.TZ1.37 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 37 | Adapted from | N/A |
Question
A secondary immune response occurs when an antigen is encountered on a second occasion, due to exposure to a pathogen that previously caused infection. Which property of some viruses explains the lack of a secondary immune response?
A. Viruses fail to induce a primary response.
B. Viruses can have a high mutation rate.
C. B cells do not interact with viruses.
D. Antibodies cannot interact with viruses.
Markscheme
B
Examiners report
[N/A]
