2 I. The history of the cell A. Anton Van Leeuwenhoek- One of the1st people to use microscope to study cells.
3 B. Robert Hooke-studied cork, the dead cells of oak bark. 1. Hooke described what he was looking at as small box-shaped structures.ORCELLS
4 C. The work of van Leeuwenhoek, Hooke, C. The work of van Leeuwenhoek, Hooke, and other scientists lead to the CELL THEORY.The cell theory has 3 parts:1. All organisms are composed of one or more cells.2. The cell is the basic unit of organization of organisms.3. All cells come from preexisting cells.
5 D. In the 1940s scientists developed another type of microscope. 1. The electron microscope magnifies structures up to 500,000x2. This allowed scientists to study the inside of cells.
6 II. Types of cellsA. There are two basic types of cells.1. Prokaryotes-cells without membrane-bound structures.a. Membrane-bound structures are called organelles (cell parts)Example: Nucleus