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AQA A LEVEL BIOLOGY EXAM WITH BEST SOLUTIONS AND CORRECT QUESTIONS AND ANSWERS

AQA A LEVEL BIOLOGY EXAM WITH BEST
SOLUTIONS AND CORRECT QUESTIONS AND
ANSWERS
what are killer t-cells? - ANSWER-- cytotoxic cells - bind to non-self antigens
how to killer t-cells work? - ANSWER-1. virus attaches to and enters host cell
2. viral DNA causes host cell to express viral antigens on its surface
3. killer t-cells attaches to viral antigens on infected cells
4. killer t-cells induces death of infected cell (apoptosis)
what is apoptosis? - ANSWER-programmed cell death
how do killer t-cells destroy cancer? - ANSWER-- cancerous = mutations - mutations = abnormal antigens - killer t-cell binds to abnormal antigens - killer t-cells induces death of cancerous cell
What does perforin do? - ANSWER-creates holes in the cell membranes in order
to destroy the infected cell
what do helper t-cells do? - ANSWER-- produce cytokines - cytokines stimulate b-cells to divide into plasma and memory cells - activate killer t-cells
define helper t-cells - ANSWER-help humoral response by involvement in the
maturation of b-cells and by triggering the production of antibodies by b-cells
what do suppressor t-cells do? - ANSWER-- halt immune response - prevent wastage of energy and resources - prevent overactive immune response - causes reduction of white blood cells after being ill
define memory t-cells - ANSWER-work in the same way as memory b-cells,
ensuring rapid response on subsequent exposure to the same non-self antigens
define suppressor t-cells - ANSWER-regulate the immune response by
suppressing activity of killer t-cells and b-cells
define 'microorganism' - ANSWER-organism that is too small to be seen without
a microscope
define 'pathogen' - ANSWER-microorganism that causes disease

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Specificaties

Niveau: University
School: Chamberlain College Of Nursing
Opleiding: NURSING
Document
Rubriek: Tentamens
Gemaakt op: 08-06-2024
Type: .pdf
Pagina's: 83
Taal: English

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