cells= the basic units of living organisms Van Leeuwenhoek= used the simple light microscope (one lens, used natural light) compound light microscope (200 years later)= uses a series of lenses to magnify objects in steps, magnifies up to 1500 times. (what we use today) Robert Hooke= designed the early compound microscope (1655); looked at cork; he saw little shapes which looked like cells in a jail (monastery), he called them "cells". Matthias Schleiden= all plants are composed of …showed first 75 words of 170 total…

…showed last 75 words of 170 total…cell 2. the cell is the basic unit of organization of organisms 3. all cells come from pre-existing cells electron microscope= uses a beam of electrons rather than light; can magnify 500,000 times. used to see structures inside of a cell Two Types of Cells: 1. prokaryotes: cells that lack internal membrane-bound structures 2. eukaryotes: cells that have internal membrane-bound structures; most plant and animal cells organelles= membrane-bound structures within a cell; "little organs" nucleus= central organelle; manages cellular functions