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

  • [NEET 2016]
  • A

    autoimmune disease

  • B

    active immunity

  • C

    allergic response

  • D

    graft rejection.

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Definitions / Explanation : Active immunity & Passive immunity
 

The antibodies are formed in

The thymus is a lobed organ located near the $...A...$ and beneath the $...B... $ The most appropriate combination for $\mathrm{A}$ and $\mathrm{B}$ is

Which of the following immune responses is responsible for rejection of kidney graft?

  • [NEET 2019]

Each antibody has $...A...$ polypeptide chains, $...B...$ small chains called $....C...$ chains and $...D...$ longer chains called $.E...$ chains

The antibody, therefore, is represented as $...F...$

Here $A$ to $F$ refers to