A) two polypeptide chains
B) four polypeptide chains
C) three amino acids only
D) five nucleotides
Correct Answer: B
Solution :
Immunoglobulin are present in serum and provide immunity to body against diseases. Each immunoglobulin is made up of four polypeptide chains two heavy weight chains and two light weight chains. These chains are joined to each other by disulphide bonds.
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