What isthe mechanism by which the AIDs virus causes deficiency of immune system of the infected person ?

Which are the chief cells of acquired, immune system?

What does the term memory of the immune system means?

What is non-specific immunity? Explain the natural barriers of immune system.

Deficiency of which vitamin causes degeneration of spinal cord?

Answer the following in one sentence : Which disease is caused due to deficiency of iodine ?

What are the various routes by which transmission of HIV virus takes place?

What is the mechanism underlying the phenomenon by which the terminal/apical bud suppresses the growth of- lateral buds? Suggest measures to overcome this phenomenon.

What would happen to immune system,if thymus gland is removed from the body of a person ?

Which are the 2 types of goitre? What are their causes?