tamination of blood used in transfusions. A retrovirus is a type of virus that contains RNA and produces a DNA analog (or counterpart) of its RNA by using a highly error-prone enzyme known as reverse transcriptase. The virus is a complex one, with two coats of protein. The outer coating fits with the receptors of T cells and the inner coating contains strands of RNA along with a few different types of enzymes. Once the virus is taken into the cell, an enzyme makes reverse transcription take place, which turns the virus' RNA into a corresponding set of DNA, which contains nine genes. A second set of enzymes insert the genes into the cell's DNA, making the cell produce protein and RNA needed to make more viruses (we can see how the virus uses the human cell for reproduce), and the third set of enzymes makes these raw materials into new viruses and moves them out of the cell membrane. These then go on to infect other cells, and the process is repeated again and again, infecting the human body.
             The reason why AIDS is difficult to c
             ...