Topic: The Basics of Cell Theory

and Cell Types

EQ: What is the cell theory?

Early Discoveries

•The development of the microscope led to the discovery of cells.

• In 1665, Robert Hooke discovered cork was made up of little empty boxes which he called cells.

Development of the Cell Theory

•Schleiden discovered that all plants are made of cells.

•Schwann discovered that all animals are made of cells.

•Virchow discovered that all cells come from other cells.

What is the Cell Theory?

1.All organisms are made up of one or more cells.

2.Cells are the basic unit of structure and function in all organisms.

3.All cells come from cells that already exist.

How Cells Differ

•Cells come in a variety of sizes and shapes.

•The structure or shape of the cell can determine what its function is.

2 Basic Cell Types

A. Prokaryotic Cells: Have no membrane around their hereditary material. Few cell parts.

Example: Bacteria

B. Eukaryotic Cells: Have a membrane that surrounds the hereditary material = the nucleus. Organelles that have specialized functions, surrounded by a membrane. Usually larger than prokaryotic cells

Example: Animals and Plants

EQ: How are prokaryotic cells EQ: How are prokaryotic cells similar? Different?similar? Different?

ProkaryoticEukaryotic

Similarity

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Be sure to draw your black frame.

Homework: Be sure to answer the EQ in your

map…. ISN 56

• We will not set up the lab for tomorrow…ISN 58 and 59..Be sure to update your table of contents….