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Presentation on theme: "THE CELL."— Presentation transcript:


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. OR CELLS

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 500,000x 2. This allowed scientists to study the inside of cells.

6 II. Types of cells A. 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


8 2. Eukaryotes-cells that have membrane-bound structures

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