1. The Cell Theory

2. Organization of Matter
Atoms- smallest unit of matter
Examples: Carbon, Hydrogen, Oxygen
Atoms come together to form…

3. Organization of Matter
Molecules- such as water, glucose,DNA
Molecules come together to form…

4. Organization of Matter
Cells- smallest unit of life
Cells come together to form…

5. Organization of Matter
Tissues- such as nervous tissue, muscle or bone
Tissues come together to form…

6. Organization of Matter
Organs- such as heart, brain, or stomach
Organs come together to form…

7. Organization of Matter
Organ systems- such as cardiovascular or nervous systems
Organ systems come together to form…

8. Organization of Matter
Multicelled organisms- such as: plants, animals, fungi, humans

9. The History of Cell Discovery
Early 1600’s
Galileo- 1st to record observations of magnified objects
insect eyes

10. The History of Cell Discovery
1665
Robert Hooke-
observed cork
“dead cells filled with juices”
Used the word “cell”- from the little rooms that monks lived in

11. The History of Cell Discovery
1670
van Leeuwenhoek
observed living cells with microscope
Looked at pond water-”animalcules”

12. The History of Cell Discovery
1820
Robert Brown
observed spherical structure in cells
“nucleus”

13. The History of Cell Discovery
1839
Schleiden
observed plants under the microscope
All plants were made of cells

14. The History of Cell Discovery
1839
Schwann
observed animals under the microscope
All animals were made of cells

15. The History of Cell Discovery
1850
Virchow
observed cells under the microscope grow in size and divide in 2
cell division

16. The History of Cell Discovery
1950
Electron Microscope
Magnifies 500,000x
Beam of electrons
Observe structures inside cells
Virtual Electron Microscope

17. The Cell Theory
The observations and conclusions of these and other scientists led to the development of The Cell Theory:
All organisms are made of one or more cells.
The cell is the basic unit of life.
All cells come from pre-existing cells

18. All Cells Have in Common:
1. Plasma membrane- boundary
2. Cytoplasm-water and dissolved molecules
Genetic material- DNA
Ribosomes – the site of protein synthesis

19. Two Cell Types
understanding size

20. Two Cell Types 1. Prokaryotes: Simpler
Genetic material is not contained in a nucleus.
No organelles
Ex. Bacteria

21. 2. Eukaryotes More complex Genetic material contained in a nucleus
Organelles- Allow different parts to perform different functions
Ex. Animal, plant, fungi and protist cells.

23. Eukaryotic Cell Structure