‘First line of defence' is known as

Against which of the following does interferon act

What is interferon

The thymus is a lobed organ located near the $...A...$ and beneath the $...B... $ The most appropriate combination for $\mathrm{A}$ and $\mathrm{B}$ is

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

Each antibody has $...A...$ polypeptide chains, $...B...$ small chains called $....C...$ chains and $...D...$ longer chains called $.E...$ chains

The antibody, therefore, is represented as $...F...$

Here $A$ to $F$ refers to