1. Unit 2 – Part 1 Review *Cell Theory *Prokaryote vs. Eukaryote Cells
*Plant vs. Animal Cells
*Cell Organelles
*Function of Organelles
*Cell Membranes
*Cell Transport

2. Cell Theory Scientists
Hooke – coined the term “cells” after observing cork under a microscope
Leeuvenhoek – said cells were like little animals “animacules”
Shleiden – discovered all plants are made up of cells
Schwann – discovered all animals are made up of cells
Virchow – discovered that all cells come from other cells

3. 3 Tenets of the Cell theory
The Cell Theory has THREE principles.
1. All living things are composed of one or more cells.
2. The cell is the most basic unit of structure of all living things.
Unicellular organisms- one cell
Multicellular – specialized regions called tissues.
Cells Tissues Organs Organ Systems Organisms
3. All existing cells come from previously existing cells.
The ability of cells to divide to form new cells is the basis for all reproduction and for the growth and repair of all multicellular organisms.

4. 2 types of Cells Prokaryote & Eukaryotes Prokaryote Both Eukaryote
No Nucleus
Have DNA
Nucleus Present
Small in size
Have Ribosomes
Larger Size
All Unicellular
Have Cytoplasm
Unicellular or Multicellular
Evolved First
Have a Cell Membrane
Came after Prokaryotes
All Bacteria
Can have a Flagella
Everything that’s NOT Bacteria
No Membrane Bound Organelles
Membrane Bound Organelles

5. Prokaryote & Eukaryote

6. 2 main types of eukaryotic cells
Plant & Animal Cells

8. Cell membranes Semi-Permeable or Selectively Permeable
Helps cell to maintain HOMEOSTASIS
Functions
Controls what enters and exits cell
Support
Protection
Made up of PHOSPOLIPIDS
Phosphate Head (Water Loving)
Fatty (Lipid) Tail (Water Fearing)

9. Cellular Transport
Active Transport- Requires ENERGY low  high concentrations
Endocytosis
Exocytosis
Protein Pumps
Passive Transport- No ENERGY high low concentrations
Diffusion
Facilitated Diffusion
Osmosis

10. Directions of Osmosis