Exocytosis moves materials out of a cell.
Endocytosis moves materials into a cell.
Active transport uses carrier proteins. (not entirely sure about this one... check it out to be sure)
Molecules move from an area of high concentration to an area of low concentration by passive transport.
I think the cytoskeletal protein that helps a cell maintain its shape is actin.
Energy loss is demonstrated more clearly on an energy pyramid than on a food web.
