The binding of antibodies to antigens to produce a large insoluble complex is known as:

Which types of cells are produced during the clonal selection of $B$-cells?

Which immunoglobulin is present in abundant amounts in the mother's initial milk secretion (colostrum)?

Antigen binds to antibody. The binding is the result of

In an antibody,disulphide bonds are present . . . . . .
$i$. between two heavy chains
$ii$. between two light chains
$iii$. between the constant region of a light chain and the constant region of a heavy chain
$iv$. between antigen binding sites of both the heavy and light chains
$v$. between the variable region of a light chain and that of a heavy chain
Select the correct answer from the options given below.

Before and after organ transplantation,it is necessary to perform: