Download The Cell Theory

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.