Which of the following components is not included as an antibody?

In which of the following tracts is Mucosa-Associated Lymphoid Tissue $(MALT)$ $NOT$ present?

Identify the cell that induces the process of $cytolysis$.

The $SCID$ patient has a defective gene for the enzyme Adenosine Deaminase $(ADA)$. He/She lacks functional ...... and therefore,fails to fight the infecting pathogens.

Select the $CORRECT$ statement.

Edward Jenner discovered