This document discusses the key points of cell theory and cell structure and function. It covers: 1. The development of cell theory by Hooke, Brown, Schwann, Schleiden, and Virchow which established that all living things are made of cells, cells are the basic unit of structure and function, and cells only come from preexisting cells. 2. The structure of the cell membrane including the fluid mosaic model and its role in controlling passage of materials via diffusion, facilitated diffusion, active transport, and endocytosis/exocytosis. 3. The importance of cells being small for efficiency and materials exchange, and examples of transport mechanisms like osmosis, facilitated diffusion, and active transport involving membrane