CELLS AS UNITS OF LIFE
Cell Theory: All living things are assemblages of cells Each cell maintains its own independent existence New cells arise only from the growth and reproduction of preexisting cells
Studying Cells: Light microscopes use light rays; they are limited in magnification and resolution. Transmission electron microscope (TEM) uses electrons passing through the specimen. Scanning electron microscope (SEM) scans surface electrons across a metal coated specimen Cell function analysis – biochemical assays of many types