2.  A cell is the basic unit of life.

3.  The development and enhancement of microscopes made the observation and description of microscopic organisms and living cells possible.

4.  The cell is the basic unit of life.  All living things are made of cells.  Cells come from pre-existing cells.

5.  1665  Looked at cork under the microscope and saw tiny empty chambers that he called cells.

6.  1674  Improved the microscope  First to see single celled organisms

7.  1838  All plants are made up of cells.

8.  1839  All animals are made up of cells

9.  1855  Proposed that all cells come from existing cells, completing the cell theory.

10.  2 Types of Cells Prokaryote Eukaryote

11.  The simplest life forms  Unicellular  Exist in two major forms: eubacteria and archaebacteria.  Lack a nucleus and membrane bound organelles.  Example: Bacteria

12. Eukaryotes arose from prokaryotes and became larger more complex. Eukaryotes contain a nucleus and organelles surrounded by a membrane.

13.  Can be unicellular or multicellular  Contain a nucleus in which their genetic material is separated from the rest of the cell.  Examples: plants, animals, fungi, and protists

14. E XAMPLES OF E UKARYOTIC CELLS

15.  Robert Hooke- observed that cork has small chambers which he called “cells”.  Anton van Leeuwenheok- helped improved the first microscope  Matthais Schleiden- all plants are made up of cells.  Theodor Schwann- all animals are made up of cells.  Rudolph Virchow- discovered that all cells come from pre-existing cells.

16.  Basic unit of life.  Cell theory  All living things are composed of cells  Cells are the basic units of structure and function in living things  New cells are produced from existing cells

17.  Prokaryotes  Do not contain a nuclei  Smaller and simpler than eukaryotes  Do contain genetic material  Unicellular only  Example: bacteria  Eukaryotes  Contain a nucleus, which contains their genetic material  Larger and more complex than prokaryotes  Unicellular and multicellular  Examples: plants, animals, fungi, and protists