1. Cells Unit Introduction
The Cell Theory and a bit of History
Prokaryote vs. Eukaryote
Kara Stevens

2. Prokaryotes and Eukaryotes
Objective:
Students will differentiate between prokaryote and eukaryote cells through MSE diagrams and notes, a venn diagram, and a worksheet.
Question:
What is the difference between endocytosis and exocytosis?

3. How did it all happen? Anton von Leeuwenhoek: 1670’s
Robert Hooke: 1665
Looked at cork under an early microscope.
He saw thousands of tiny, empty chambers.
He called them cells.
Anton von Leeuwenhoek: 1670’s
Observed tiny organisms moving in pond water.
He called them animalcules.

4. More History
1838: Mathias Schleiden, a German botanist (plant scientist) concluded:
All plants are made of cells
1839: Theodore Schwann, a German zoologist (animal scienist)
All organisms are made of cells
1855: Rudolf Virchow, a German doctor
Disputed spontaneous generation
Concluded all cells come from other cells
1862: Louis Pasteur
Said microscopic organisms can be the cause of contagious disease

5. The Cell Theory
1. All living things are composed of cells. 2. Cells are the basic unit of structure and function in living things. 3. New cells are produced from existing cells.

6. All Cells Have: All cells are surrounded by a membrane
They contain DNA at some p0int in their life

7. Prokaryote Cells No nucleus DNA floats in the cell
Very small cells
No nucleus
DNA floats in the cell
More simple (not many organelles)
Single celled only (unicellular)
Example is bacteria

8. Eukaryote Cells These have a nucleus that contains the DNA
They are large and more complex
They contain many organelles
(mini organs for the cell)
Single celled or
multicellular organisms
Can be highly specialized (do many types of jobs).
Ex: plants or
animals

9. Prokaryote and Eukaryote Draw this!
Prokaryotic Cell
Cell membrane
Cytoplasm
Eukaryotic Cell
Nucleus
Organelles

10. Quick, Make a Venn Diagram!
Prokaryotes
Eukaryotes

11. Did you do it right? Eukaryotes Prokaryotes Have nuclei
Large and complex
Have organelles
Can be highly
specialized
Single celled OR
multi-cellular
Prokaryotes
No nuclei
Small and simple
Single-celled
Ex: All bacteria
Cell
membrane
DNA at some
point in life
Have cytoplasm
Ex: plants or
animals