The plasma membrane of either a plant or animal cell regulates traffic of materials in and out of the cell. Animal cells that produce and secrete steroid hormones typically have far more smooth endoplasmic reticulum than does the average cell. In the endoplasmic reticulum, some proteins get glycosylated. There are transporter proteins in the plasma membrane to facilitate transfer of ions into the cell. The pores in the nuclear membrane are there to allow DNA to exit the nucleus and enter the cytosol.
Cholesterol is sometimes present in the plasma membranes of animal cells.
In chloroplasts, light energy is converted to chemical energy. In chloroplasts, the inner membrane has a greatly enlarged surface area compared to the outer membrane. The outer membrane of the mitochondria has a greatly enlarged surface compared to the inner membrane. The cell membrane of both prokaryotes and eukaryotes contains lipids and proteins. The nucleolus is where genetic material is stored in prokaryotes.