NEET 2014 Biology question

At which stage of HIV infection does one usually show symptoms of AIDS?

(1)Within 15 days of sexual contact with an infected person
(2)When the infected retro virus enters host cells
(3)When HIV damages large number of helper T-LymphocytesCorrect
(4)When the viral DNA is produced by reverse transcriptase

Answer: (3)

Solution

After HIV enters the body it infects macrophages and helper T-lymphocytes (TH cells), where RNA is reverse-transcribed into viral DNA, which integrates and replicates. For a long incubation period (6 months to 5-10 years) there are no symptoms. As the

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Question ID VK-091647