4-1 Introduction to the Cell. Important events in the discovery of the cell and the development of the cell theory…. 1665 – Robert Hooke. Observed cells in cork. Coined the term "cells”. Cork Cells. 1673- Anton van Leeuwenhoek. Created a powerful microscope. 1827-33 - Robert Brown.
Observed cells in cork.
Coined the term "cells”.
Created a powerful microscope
-noticed that pollen grains in water jiggled around called “Brownian motion”
-discovered the nucleus
Human Cheek Cell
A botanist who concluded that all plants are made of cells.
Typical Plant Cell
A zoologist who concluded that all animals
are made of cells.
A physician who did
research on cancer cells and concluded
“Omnis cellula e cellula”.
“All cells are from other
1. All living things are composed of one or more cells.
2. Cells are the basic units of structure and function in an organism.
3. Cells come only from existing cells.
both in size, shape, and internal organization.
……..we’ll come back to this later.
Mycoplasmas - bacteria that are 0.1 to 1.0 mm. (1/10 the size of regular bacteria).
Note: 1.0 mm = one millionth of a meter
Prokaryotes- simple cells that do not have internal membranes
example = bacteria
Eukaryotes- more complex cells that do have internal, membrane-bound structures
examples = plants and animals
First appeared 3.5 BYA
First appeared 2.0 BYA
include protists, fungi, plants and animals