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Which one of the following statements is correct with respect to immunity?
A
Rejection of a kidney graft is the function of B-lymphocytes
B
Preformed antibodies need to be injected to treat the bite by a viper snake
C
The antibodies against small pox pathogen are produced by T-lymphocytes
D
Antibodies are protein molecules, each of which has four light chains
Detailed Solution
In a snake bite, a quick immune response is needed, so preformed antibodies against the venom (antivenom) are injected. This is passive immunisation and the statement is correct.
Graft rejection is brought about by cell-mediated immunity, i.e., by T-lymphocytes, not by B-lymphocytes.
Antibodies are produced by B-lymphocytes (plasma cells); T-lymphocytes do not secrete antibodies but help B-cells.
Each antibody molecule has four peptide chains: two light chains and two heavy chains ($H_2L_2$), not four light chains.
Hence the correct statement is that preformed antibodies need to be injected to treat the bite of a viper.
Graft rejection is brought about by cell-mediated immunity, i.e., by T-lymphocytes, not by B-lymphocytes.
Antibodies are produced by B-lymphocytes (plasma cells); T-lymphocytes do not secrete antibodies but help B-cells.
Each antibody molecule has four peptide chains: two light chains and two heavy chains ($H_2L_2$), not four light chains.
Hence the correct statement is that preformed antibodies need to be injected to treat the bite of a viper.