Antigen is a substance which

  • [AIIMS 2010]
  • A

    lowers body temperature

  • B

    destroys harmful bacteria

  • C

    triggers the immune system

  • D

    is used as an antidote to poison

Similar Questions

The term ’active immunity' means

  • [AIPMT 1999]

Give scientific reasons : Autoimmune diseases are different from immune deficiency diseases.

$A$ - The vaccines generate memory - $B$ and $T$ - cells. $R$ - In vaccination activated pathogens are introduced into the body.

Match the columns :

Column - $I$ Column - $II$
$(a)$ Physical barrier $(1)$ skin
$(b)$ Physiological barrier $(2)$ interferon protein
$(c)$ Cellular barrier $(3)$ leucocytes
$(d)$ Cytokine barrier $(4)$ Saliva in the mouth

 

Transplantation of tissues/organs fails often due to non­acceptance by the patient’s body. Which type of immune response is responsible for such rejections?

  • [NEET 2017]