B cells:

1.	Do not produce antibodies but help T cells produce them
2.	Are pathogen specific but do not retain the memory of previous encounters
3.	Lack ability to distinguish between self and non-self
4.	Are involved in humoral immune response

In an antibody molecule, an antigen binding site is located:

1. In the constant portion

2. At the C – terminus of a heavy chain

3. Between a light and a heavy chain

4. Between two heavy chains

Active immunity develops when:

A foetus receiving some antibodies from mother through placenta is an example of:

The principle of immunization or vaccination is based on which property of the immune system?

1. Specificity

2. Memory

3. Ability to recognize self from non-self

4. Cooperation between innate and adaptive immunity

What type of immunity is used in the treatment of a patient of snakebite?

A drug that would not be helpful in the treatment of allergies is:

Secondary lymphoid organs:

Which of the following is not a function of spleen?