2023 AQA A-LEVEL BIOLOGY 7402/3 PAPER 3 QUESTION PAPER & MARK SCHEME (MERGED) JUNE 2023[VERIFIED]100% PASS
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Course
2023 AQA A-LEVEL BIOLOGY
Institution
2023 AQA A-LEVEL BIOLOGY
2023 AQA A-LEVEL
BIOLOGY 7402/3 PAPER 3
QUESTION PAPER &
MARK SCHEME
(MERGED) JUNE
2023[VERIFIED]100% PASS
where are t-cells made?ANSWERthymus gland
where do b-cells mature?ANSWERbone marrow
what do b-cells do?ANSWER- humoral response
- release antibodies
- complementary to a specific ant...
2023 AQA A-LEVEL
BIOLOGY 7402/3 PAPER 3
QUESTION PAPER &
MARK SCHEME
(MERGED) JUNE
2023[VERIFIED]100% PASS
,where are t-cells made?✔✔✔ANSWER➖thymus gland
where do b-cells mature?✔✔✔ANSWER➖bone marrow
what do b-cells do?✔✔✔ANSWER➖- humoral response
- release antibodies
- complementary to a specific antigen
what response are plasma
cells?✔✔✔ANSWER➖primary
what response are memory b-
cells?✔✔✔ANSWER➖secondary
,outline the humoral response✔✔✔ANSWER➖1. antigen
attaches to complementary antibody on b-cell
2. antigen taken into cell (endocytosis)
3. presented on cell surface membrane
4. t-helper cells bind to antigen and stimulate b-cell to
divide
what does mitosis do in humoral
response?✔✔✔ANSWER➖- forms clones of b-cells
(plasma and memory)
- clonal response
what do clones do?✔✔✔ANSWER➖each clone can
produce one type of antibody (monoclonal) which can be
used in medicine
, - only survive for a few day
- slow response = person gets ill before pathogen is killed
outline memory cells✔✔✔ANSWER➖- secondary
response
- circulated in blood and tissue fluid
- divide rapidly
- rapid response so person doesn't get ill
what is an antibody?✔✔✔ANSWER➖y-shaped globular
protein produced by b-cells
where are antibodies produced?✔✔✔ANSWER➖plasma
b-cells
what are antibodies made of?✔✔✔ANSWER➖4
polypeptide chains -- 2 heavy, 2 light
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