Which is the main physical barrier in our body?

  • A
    Mucus
  • B
    Saliva
  • C
    Skin
  • D
    Tears

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The immune system of an old person becomes weak because of . . . . . . .

Select the incorrect statement regarding passive immunity.

Identify the cells that assist $B$-lymphocytes in the production of antibodies.

The immunity developed by a child after an attack of measles is . . . . . . immunity.

Assertion: The antibodies separated from serum are homogenous.
Reason: Monoclonal antibodies are homogenous immunological reagents.

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