NEET 2012 Biology question

Which one of the following statements is correct with respect to immunity ?

(1)Rejection of a kidney graft is the function of B-lymphocytes
(2)Preformed antibodies need to be injected to treat the bite by a viper snakeCorrect
(3)The antibodies against small pox pathogen are produced by T-lymphocytes
(4)Antibodies are protein molecules, each of which has four light chains

Answer: (2)

Solution

After a snake (viper) bite, the victim is injected with preformed antibodies (antivenom/antitoxin); this is passive immunisation, which gives immediate protection because the body cannot make antibodies quickly enough. Hence (2). (1) wrong: graft

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Question ID VK-091032