Passive acquired immunity can be obtained through the introduction of which of the following?

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.

In higher vertebrates,the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells,then it leads to

Some people who have suffered from a disease may not be affected again during their lifetime; such immunity is called

Which cells are responsible for the immune response during organ transplantation?

Antibodies are ........