$A$ person who met with a road accident is likely to develop tetanus. He is immunized by administering:

State the number of polypeptide chains in $H_{2}L_{2}$ (an antibody molecule).

What can be included in $CMI$?

Antibodies in our body are complex of ........

Interferons are proteins that...

Which of the following statements are correct regarding the structure and types of antibodies in humans?
$i$. Antibodies are also called Immunoglobulins that are produced as an immune response to antigenic stimulation.
$ii$. They are produced by all types of $T$-lymphocytes and $B$-lymphocytes.
$iii$. An antibody is a $Y$-shaped molecule formed of four polypeptide chains. Antibodies present in plasma determine many blood group systems like $ABO$,$Rh$,$P$,$MNS$ etc.
$iv$. An antibody molecule consists of two antigen-binding sites called paratopes.