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.
HIV grabs onto cells that have a receptor called CD4. Cells with the CD4 receptor are an important part of the body's system for fighting all diseases (our immune system). HIV gradually destroys these cells and cripples the immune system. It turns out that CD4 isn't enough.