Local Weather. Brewing tropical cyclone in Bay of Bengal won't bring heat relief to India. April 13, 2017, 9:40:41 AM EDT. A budding tropical cyclone in the Bay of Bengal is expected to target Myanmar, preventing India from welcoming any relief from the dangerous heat wave. Tropical depression to soak central Philippines Easter weekend. April 14, 2017, 7:00:42 AM EDT.
HIV is a retrovirus. HIV is an enveloped retrovirus. Each virus particle contains two copies of an RNA genome. The virus also has a number of enzymes: reverse transcriptase, integrase and viral protease. These molecules play an important role in making new copies of HIV and can be the targets of antiretroviral drugs.
A retrovirus is a single-stranded positive-sense RNA virus with a DNA intermediate and, as an obligate parasite, targets a host cell. Once inside the host cell cytoplasm, the virus uses its own reverse transcriptase enzyme to produce DNA from its RNA genome, the reverse of the usual pattern, thus retro (backwards). The new DNA is then incorporated into the host cell genome by an integrase enzyme, at which point the retroviral DNA is referred to as a provirus.