Goal 2 - Cell Discovery
The Scientists
Anton van Leeuwenhoek – Dutch lens maker.
Theodore Schwann – Observed a variety of animals and concluded that all animals are made of cells.
Rudolph Virchow – Concluded that ALL living things are made of cells.
Anton van Leeuwenhoek – Dutch lens maker.
- Looked at pond water through a simple glasses lens. He saw moving objects. He called them “beasties”. These were 1st viewed microscopic living things.
- He is credited with invention of the simple light microscope (contained one lens and used light to view objects).
- Lived at the same time as Leeuwenhoek.
- Use a compound light microscope (series of lenses to magnify objects) to study cork (dead cells of oak bark).
- Saw geometric shapes. He called them cells because they reminded him of the small rooms monks lived in a monastery
Theodore Schwann – Observed a variety of animals and concluded that all animals are made of cells.
Rudolph Virchow – Concluded that ALL living things are made of cells.
Cell Theory
Made up of three main ideas:
Made up of three main ideas:
- All organisms are composed of one or more cells.
- The cell is the basic unit of structure and organization of organisms.
- All cells come from preexisting cells (cells come from living cells).
Electron Light Microscope
Invented in the 1940’s Uses a beam of electrons instead of light 2 types 1. SEM = Scanning Electron Microscope – used to scan the surface of the cell to learn their 3-D shape. 2. TEM – Transmission Electron Microscope – allows scientists to study the structures located within the cell. |
Two basic Types of cells
Cells contain “little organs” called organelles.
Organelles like organs in our body each have a different function.
Cells can be divided into two broad groups:
Cells contain “little organs” called organelles.
Organelles like organs in our body each have a different function.
Cells can be divided into two broad groups:
- Cells with membrane bound organelles
- Cells without membrane bound organelles
Prokaryotes and Eukarotes
Prokaryote
Eukaryote
- No membrane bound organelles
- Pro – means 1st or before
- Karyon – means center
- Thus these cells have no center – NO nucleus
- Example = bacteria, Unicellular, “one celled”
Eukaryote
- Eu – means true
- Karyon – means center
- Thus these cells have a center – Nucleus
- Can be unicellular or multicellular
- Examples – animals, plants, algae, yeast