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HIV (Human Immunodeficiency Virus):lentovirus (slowly-replicating retrovirus); has RNA as genetic material and synthesizes DNA, using reverse transcriptase to incorporate its genetic material into host's genome; causes acquired immunodeficiency syndrome (AIDS); may be spread by contact with body fluids, including blood/semen; binds to CD4 receptors on the surface of target cells within its host; uses host cell's own enzymatic machinery-drugs can interfere w/ host's functions & cause side…

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Retroviruses like HIV depress selenium levels in their hosts by encoding the gene for the human selonenzyme glutathione peroxidase. This allows the virus to replicate indefinitely by continuously depriving the host of glutathione (an inhibitor of reverse transcriptase,) and the four basic components of glutathione peroxidase: selenium, cysteine, glutamine and tryptophan. As levels of selenium decline so do CD4 cells which allow "opportunistic" pathogens to invade the immune system and…

Over time, due to each cell division, the #telomere ends become shorter. They are replenished by an enzyme, telomerase reverse transcriptase (abbreviated to #TERT, or #hTERT in humans) a catalytic subunit of the enzyme #telomerase, which, together with the telomerase RNA component ( #TERC), comprises the most important unit of the telomerase complex.