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Cells Alive!
Cell History
1. The invention of microscope led to the study of cells
2. Notable Scientists
a. Robert Hooke: 1st to describe the cell
b. Schleiden: Plants are composed of cells
c. Schwann: Animals are composed of cells
Cell Theory
1. All organisms are made of one or more cells
2. The cell is the basic unit of structure and
function
3. All cells come from preexisting cells
(Virchow)
Cell Types
Two Types: Prokaryotic and Eukaryotic
Prokaryotic
1. No true Nucleus: Nuclear material
scattered like a scrambled egg
2. Simple cell; very few cell organelles
3. Most are unicellular
4. Ex. e. coli bacteria
Cell types
Eukaryotic
1. True nucleus: Cell looks egg cooked sunny
side up!
2. Complex cell; many cell organelles
3. Single or multicellular
4. Ex.
Plant Cell
or
Animal Cell
Animal Cells vs. Plant Cells
Centrioles
chromosome
Animal Cells vs. Plant Cells
Animal Cells
 No Cell Wall
No Chloroplasts
Irregular Shape
Many small Vacuoles
Centrioles
Lysosomes
Plant Cells
Cell Wall
Chloroplasts
Regular Shape
One large vacuole
No centrioles
No Lysosomes
Cell Organization
Cells>Tissues>Organs>Systems
Cells: The basic unit of life
Tissues: A group of cells functioning
together to perform an activity
Organs: Groups of two or tissues working
together
Systems: A group of organs working
together to carry out major life functions