Biology OCR A level Paper 2 EXAM QUESTIONS AND ANSWERS 100% CORRECT!
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Biology OCR A level Paper 2 EXA
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Biology OCR A Level Paper 2 EXA
Role of cytokines during inflammation - ANSWER Attract phagocytes to the site then phagocytosis and increase temp, act as cell signalling molecules
Structure of neutrophil - ANSWER Nucleus looks like 3 interconnected blobs -multilobed. Cytoplasm is grainy
Structure of lymphocyte - ANSWER Smal...
Examples of protoctista - ANSWER Malaria, potato/tomato late blight
Examples of fungi - ANSWER Ringworm (cattle), athletes foot, black sigatoka
(bananas)
Spores - ANSWER The cells that some organisms use to reproduce asexually,
including some protocista and all fungi
What does mucus contain - ANSWER Antimicrobial enzymes
Thromboplastin - ANSWER The enzyme that triggers cascade of reactions to form a
clot
Role of serotonin in blood clotting - ANSWER Makes smooth muscle in walls of blood
vessels contract, reduce blood supply to that area
Role of histamines in inflammation - ANSWER Make blood vessels dilate --> heat,
redness, prevents pathogens reproducing. Make vessel walls more leaky so blood
plasma is forced out --> swelling, pain
Role of cytokines during inflammation - ANSWER Attract phagocytes to the site then
phagocytosis and increase temp, act as cell signalling molecules
Structure of neutrophil - ANSWER Nucleus looks like 3 interconnected blobs -
multilobed. Cytoplasm is grainy
Structure of lymphocyte - ANSWER Smaller than neutrophil. Nucleus takes up most of
the cell
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