CAPE Biology Unit 2 · 2014 · Paper 1 · Question Q37
Passive artificial immunity is effective but only for a short time. Which of the following is the BEST explanation for this?
- (A)Antigens are rapidly destroyed.
- (B)Antibodies are rapidly broken down.
- (C)Phagocytes have a short life span.
- (D)Memory cells have a short life span.
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