The Basics of Cell Theory and Cell Types

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.

Think Pair Share How did the development of the microscope aid the study of cells? What if the microscope had never been invented?

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.

Cell Types Prokaryotic Cells: Have no membrane around their hereditary material. Example: Bacteria Eukaryotic Cells: Have a membrane that surrounds the hereditary material = the nucleus. Example: Animals and Plants

Think Pair Share How can you differentiate between prokaryotic and eukaryotic cells?

Learning Scale 4 - Justify why each of the cellular processes is important to maintaining homeostasis. 3 - Describe how cells undergo similar processes to maintain homeostasis. 2 - Recognize that cells undergo similar processes. 1 - Identify and describe the components of the cell theory.