Some psychiatrists and/or psychotherapists believe that the symptoms of conversion disorder may be symbolic resolutions of psychological conflicts. For example, in some cases vomiting may represent revulsion and disgust, or blindness may represent the inability to accept the witnessing of a traumatic event.
Some of the most important characteristics of prokaryotic cells are as follows: The prokaryotic (Gr., pro-primitive, karyon-nucleus) cells are the most primitive cells from morphological point of view. They occur in bacteria and blue green algae.
All prokaryotic cells contain large quantities of genetic material in the form of DNA and RNA. Because prokaryotic cells, by definition, do not have a nucleus, the single large circular strand of DNA containing most of the genes needed for cell growth, survival, and reproduction is found in the cytoplasm.rokaryotes known as  gram-negative bacteria , for example, often have two plasma membranes with a space between them known as the periplasm. As in all cells, the plasma membrane in prokaryotic cells is responsible for controlling what gets into and out of the cell.