Components of All Cells
All cells contain these same four components: 1. plasma (cell) membrane, a phospholipid bilayer with a mosaic of proteins, which functions as a barrier between the cell and its environment. 2. cytoplasm, the region between the region of DNA and plasma membrane, and the cytosol, a fluid, jelly-like region inside the cell where chemical reactions take place. 3. DNA, the heredity information of cells, which can be found in a nucleus of eukaryotic cells and the a nucleoid region of prokaryotic cell. 4. ribosomes, or protein-synthesizing structures composed of ribosomes and proteins. These structures can be found on the image of the plant cell (Figure 188.8.131.52.1).