When an organ is transplanted and is rejected by the body,the lymphocytes responsible for the rejection are produced by:

An antiviral chemical produced by the animal cell is

The antigen-binding site in an antibody is found between:

Which of the following cells act as phagocytes?

In the figure,the structure of an antibody molecule is shown. Name the parts $A$,$B$,and $C$.

Consider the following four statements $(i-iv)$ regarding kidney transplantation and select the two correct ones.
$(i)$ Even if a kidney transplant is successful,the recipient needs to take immunosuppressants for a long time.
$(ii)$ Cell-mediated immune response is responsible for the rejection of the graft.
$(iii)$ $B$-lymphocytes are responsible for the rejection of the graft.
$(iv)$ The acceptance or rejection of a transplanted kidney depends on specific interferons.