In the list definition XML, add a ContentTypeRef element to the ContentTypes element. Set the ID attribute of the ContentTypeRef element to the content type ID of the content type that you want to include on the list.or more information about the ContentTypes element in the list definition schema, see ContentTypes Element (List) . Adding Content Types to an Existing SharePoint List. You can use the SharePoint Foundation object model to add content types to an existing list.
Prokaryotic Cell Structure. Prokaryotic cells are not as complex as eukaryotic cells. They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Prokaryotic organisms have varying cell shapes.
The Structure of Prokaryote and Eukaryote Cells During the 1950s, scientists developed the concept that all organisms may be classified as prokaryotes or eukaryotes. The cells of all prokaryotes and eukaryotes possess two basic features: a plasma membrane, also called a cell membrane, and cytoplasm. However, the cells of prokaryotes are simpler than those of eukaryotes. For example, prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus. Prokaryotic cells lack internal cellular bodies (organelles), while eukaryotic cells possess them. Examples of prokaryotes are bacteria and archaea.