CAIE A-Level Biology AS 11.1.4 Memory Cells and Long Term Immunity Questions
Explain how memory cells produce long-term immunity using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain how memory cells produce long-term immunity after an immune response.
CAIE A-Level Biology AS 11.1.4 Memory Cells and Long Term Immunity Questions question 1
[Maximum number: 3]
In the immune system, a plasma cell develops from an activated B-lymphocyte. Mature plasma cells synthesise and secrete antibody molecules.
Clonal expansion also results in the production of memory B-lymphocytes.
Explain the importance of clonal expansion and the production of memory B-lymphocytes in providing protection for a person against an infectious disease.
any three from: large numbers of B-lymphocytes / plasma cells (in primary immune response)
1 large quantity of (specific) antibody, produced / released or
(large quantity of) antibody to form antibody-antigen complexes / to bind antigen (for phagocytosis) / AW ;
large numbers of memory B-lymphocytes so
2 provide long term immunity / memory cells long-lived / provides immunological memory ;
A remain in, circulation (for a long time) AW
3 able to produce fast(er), secondary (immune) response ;
A second response will be fast(er)
A immune response faster on second encounter (with antigen / pathogen) / AW
4 higher concentration / faster production, of antibodies (than primary response);
I 'more' alone
5 person does not have, symptoms / become ill (of/from, same disease) ;
A presence of same, pathogen / antigen, does not cause disease
6 AVP ;
memory cells can (divide to) produce plasma cells more plasma cells present than primary response able to form more memory cells
All question bank results loaded