describe the structure and function of the cell membrane, the nucleus and the cytoplasm
cell membrane: double layer of fat (phospholipid) with proteins. forms a barrier; controls what enters and leaves the cell.
nucleus: spherical; it is made of DNA and proteins (holes in membrane). DNA in nucleus controls protein synthesis thus controlling all cell activites.
cytoplasm: is cell liquid (water and proteins). cyto plasm has organelles in it; it is the place where many cell reactions occur