1. The Characteristics of Cells
Living Things Are Made of Cells
Organisms- any living thing Ex. Bacteria
A living thing is composed of cells or was once composed of cells. Ex, mushroom or dead tree limb
A nonliving thing was never alive and never had cells.
Cells – the smallest unit of a living thing. Smallest living thing

2. Cells are the Building Blocks of Life
Unicellular- organism composed of one cell.
Example Bacteria, amoeba
Multicellular- organisms composed of more than one cell
Example: All animals and most plants are multicellular

3. The Cell Theory New cells are only produced from other living cells
Cells Come From Existing Cells
New cells are only produced from other living cells
Cells reproduce
To create new cells so that the organism can grow and carry out life processes
To replace old, weak, dead cells
To continue the survival of unicellular species

4. The Cell Theory All living things are made of one or more cells
Cells are the smallest unit of living things
All cells come from preexisting cells through cell division

5. Robert Hooke
How Did He Discover/Name Cells
While looking at a thin slice of cork under the microscope, he saw small compartments that reminded him of a monk’s room in a monastery called a “cell.”
Why Was His Discovery Important
His findings led to the scientific study of the cell (cell biology) and the creation of the cell theory
Who Was He?
Born in England1635/Died 1703
Was an architect, naturalist and scientist
Worked with cells and physics
What Did He Do?
Built a compound Microscope
Used it to examine organisms such as insects

6. Scientist Contributions to the Cell Theory
Anton van Leeuwenhoek
Created his own microscope
Was the first microbiologist.
Discovered single celled organisms he called animalcules. Today they are known as bacteria.
1838 Matthias Schleiden concluded all plants are made of cells
1839 Theodor Schwann concluded all animals are made of cells
1855 Rudolf Virchow proposed cells are formed from only from cells that already exist. All cells come from cells

7. Parts of the Microscope
1. allows user to change objective lenses
2. lenses that rotate on the microscope, each of which has a different magnification
3. holds the microscope slide in place
4. place to put the slide
5. regulates the amount of light that hits the slide
6. light source
7. the eyepiece or first lens the user looks through
8. keeps the two sets of lenses the correct distance apart
9. place where user holds microscope
10. moves the stage up and down to bring specimen into focus
11. moves objective to make the image sharper
12. holds up the microscope

8. Microscope Parts 1. Rotating Nosepiece 2. Objective Lens
3. Stage Clips
4. Stage
5. Diaphragm
6. Light Source
7. Ocular Lens
8. Body Tube
9. Arm
10. Coarse Adjustment Knob
11. Fine Adjustment Knob
12. BAse
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