In prokaryotes, the DNA (chromosome) is in contact with the cellular cytoplasm and is not in a housed membrane-bound nucleus. In eukaryotes, however, the DNA takes the form of compact chromosomes separated from the rest of the cell by a nuclear membrane (also called a nuclear envelope).Eukaryotic cells also contain a variety of structures and organelles not present in prokaryotic cells.ver time, portions of the DNA from the other prokaryote remaining in the cytoplasmic part of the cell may or may not have been incoporated into the new eukaryotic nucleus (Figure 3). Figure 3: Origin of a eukaryotic cell. A prokaryotic host cell incorporates another prokaryotic cell.
HIV can have devastating effects on the body. There may not be any serious symptoms for ten years or more, but if untreated the fatal illness AIDS will develop.HIV seriously affects the immune system and leaves it open to infection from numerous sources.People with HIV can develop cancers such as Kaposi's sarcoma, lymphoma, cervical cancer, and cancer of the rectum. HIV can affect the brain, kidneys, heart, and other organs, causing severe and life-threatening symptoms.IV seriously affects the immune system and leaves it open to infection from numerous sources. People with HIV can develop cancers such as Kaposi's sarcoma, lymphoma, cervical cancer, and cancer of the rectum.
Human immunodeficiency virus (HIV) infects the cells of the immune system. In particular, HIV attacks and destroys the T helper lymphocytes, or T-cells, which are crucial to the immune system and immune response.These cells are also called CD4-positive lymphocytes because HIV uses the protein CD4, present on the surface of the cell, to attach itself and pry its way into the cell.) Each day, your body produces millions of CD4+ T-cells to help maintain your immunity and fight off invading viruses and germs.