Immune System
Natural killer cells are involved in

tumour rejection
allograft rejection
all of these
non-specific killing of virus transformed target cells

ANSWER DOWNLOAD EXAMIANS APP

Immune System
Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?

By rearrangements of the DNA encoding the variable regions of the heavy and light chains
Both (a) and (b)
Antibody proteins can physically change their shape to bind different epitopes
By the combination of different heavy and light chains that form the antigen binding site

ANSWER DOWNLOAD EXAMIANS APP