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.
Untreated, HIV reduces the number of CD4 cells (T cells) in the body. This damage to the immune system makes it harder and harder for the body to fight off infections and some other diseases. Opportunistic infections or cancers take advantage of a very weak immune system and signal that the person has AIDS. Learn more about the stages of HIV and how to know whether youâre infected. What Is HIV? HIV stands for human immunodeficiency virus. It is the virus that can lead to acquired immunodeficiency syndrome, or AIDS, if not treated. Unlike some other viruses, the human body canât get rid of HIV completely, even with treatment.