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STD 12 - 7. human health and disease — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 7. human health and disease1 Mark
MCQ
Choose the wrong statement regarding $AIDS$.
  • A
    $AIDS$ is an immunodeficiency disease
  • B
    It is caused by the retrovirus $HIV$
  • ✓
    $HIV$ selectively infects and kills $B-$lymphocytes
  • D
    Retroviruses have $RNA$ genomes that replicate via $DNA$ intermediate
✓

Answer

Correct option: C.
$HIV$ selectively infects and kills $B-$lymphocytes
c
$AIDS$ (Acquired Immuno Deficiency Syndrome) is caused by $HIV$ (Human Immunodeficiency Virus). This virus selectively infects and kills the helper $T-$lymphocytes. Hence, the disease is characterized by reduction in the number of helper $T-$lymphocytes and breakdown of the immune system of the body.

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