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STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 7. human health and disease4 Marks
MCQ
Which of the following is correct regarding $AIDS$ causative agent $HIV$ ?
  • A
    $HIV$ is enveloped virus containing one molecule of single­stranded $RNA$ and one molecule of reverse transcriptase.
  • B
    $HIV$ is enveloped virus that contains two identical molecules of single­stranded $RNA$ and two molecules of reverse transcriptase.
  • C
    $HIV$ does not escape but attacks the acquired immune response.
  • ✓
    Both $(b)$ and $(c)$
✓

Answer

Correct option: D.
Both $(b)$ and $(c)$
d
(d) : $HIV$ is spherical virus with a diameter of about $90-­120\ nm$. Its genome consists of a single­ stranded $RNA$ filament segmented into two identical filaments and associated with reverse transcriptase enzymes. The envelope consists of a lipid bilayer derived from host cell membrane and projecting knob like glycoprotein spikes. It contains two protein coats. $HIV$ is a retrovirus that attacks helper $T$ cells. Without an adequate supply of helper cells, the immune system cannot signal $B$ cells to produce antibodies to kill infected cells, thus body becomes susceptible to infections. This immune deficiency is described by the name acquired immune deficiency syndrome or $AIDS$.

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