Download Cellular Organization and Cell Theory Notes

Cellular Organization and Cell Theory Notes
Cell is a membrane-covered structure that contains all the
necessary material for life.
Unicellular – organisms that are composed of only one cell
Multi-cellular – organisms that are composed of more than one cell
A) Cellular Organization
complex
Organism
Composed of 2 or more organ
systems
Organ System
Composed of 2 or more organs
Organ
Composed of 2 or more tissue
Tissue
Composed of 2 or more cells
simple
Cell
Basic unit of life
B) History of the Cell
Rudolf Virchow says
Matthius Schleiden says
Anton Van Leeuwenhoek
all living things come
that the cell is the basic
looked at pond water to
from other living cells
unit of structure in
see the first living cells.
plants
1
1
1
1
1
6
6
8
1
8
8
6
7
3
8
3
3
5
5
1
5
8
9
8
Robert Hooke
Robert Brown discovers
discovers dead
the nucleus of the cell
Cork cells
Theodor Schwann says that
the cell is the basic unit of
structure in animals
C) Cell Theory
These work and discoveries of these Scientist helped develop the Cell Theory. The invention
and improvement of the microscope was directly involved with coming up with the theory
The Cell Theory states:
1) All organisms are composed of one or more cells
2) The cell is the basic unit of life in all living things
3) All cells come from existing cells
Exceptions to the Cell Theory
– Where did the first cell come from?
– Viruses (can’t reproduce by themselves)