All eukaryotic cells have within them a variety of different structures called organelles. Organelles are small and function much like organs function in a large organism. Some organelles are responsible for gathering cell energy, others for controlling cell activities.Note-although this organelle is also found animal cells, the vacuoles from plant cells are drastically bigger and play a much more important role in the processes of the cell.
HIV crossed from chimps to humans in the 1920's in what is now the Democratic Republic of Congo. This was probably as a result of chimps carrying the Simian Immunodeficiency Virus (SIV), a virus closely related to HIV, being hunted and eaten by people living in the area.
diseases similar to HIV. ...The HTLV-I virus and HIV are transmitted the same way, and infect the same cells of the body. However HTLV-I does not cause AIDS ! Instead, HTLV-I causes a rare form of leukemia and also causes specific types of neurological problems. Like HIV ,... Read more Â».