did you know that the tubules of smooth ER also have enzymes embedded on the inner surface for processing macromolecules such as lipids? in addition to synthesizing phospholipids, smooth ER can have specialized functions in differnt cells. For example, the smooth ER produces testosterone (a lipid) in testicular cells. O_o dont' we all learn something new everyday :P
i'm going to die on my bio test tommorow.
cram cram cram .... O_-