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Question

Identify I,II,III in the given image


A
I- Viral DNA, II- Viral particles and Viral DNA, III- Copies of virus with RNA
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B
I- Viral RNA, II- Bacterial particles, III- Copies of virus with DNA
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C
I- Viral particles, II-Viral DNA, III- Copies of virus with DNA
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D
I- Viral DNA, II- Viral particles and Viral RNA, III- Copies of virus with RNA
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Solution

The correct option is D I- Viral DNA, II- Viral particles and Viral RNA, III- Copies of virus with RNA
Replication of HIV
1.When the HIV virus enters the human body it attacks macrophages to replicate and simultaneously enter T helper cells where it eventually disintegrates the T helper cells after replication
2.The surface of T helper cells has numerous glycoprotein receptors to which the flexible HIV surface proteins attach
3. After binding on to the T helper cells surface the viral envelop diffuses on its surface and only HIV RNA enters the cell Undergoes reverse transcription using host cells machinery to HIV DNA.
4. HIV DNA incorporates into the T helper cells DNA and directs the infected cells to produce viral particles (HIV RNA and viral particles - viral envelop ,capsid,enzymes)
5.Copies of viral particles assemble and are then released out of the infected cells T helper cells.
6.Viruses mature and become capable of infecting other TH cells. This infected TH cell finally disintegrates. After some years the infected TH cells start dying more quickly than they can be replaced thus immunity is severely compromised.

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