1. Chapter 3.3: Cell Membranes
Chapter 3: Cells
Section 3: Cell Membranes
Unit 6: Cell Biology
Chapter 3.3: Cell Membranes

2. Cell Membrane Presentation Inquiry Investigation
Chapter 3: Cells
Section 2: Cell Organelles
Agenda for Today
Do Now!
Cell Membrane Presentation
Inquiry Investigation
Cell Membrane Modelling

3. Recall: Why do phospholipids orient themselves in water like they do?
Chapter 3: Cells
Section 3: Cell Membrane
Phospholipids
Have a phosphate/glycerol head and two fatty acid tails.
Head is hydrophilic & tails are hydrophobic.
Naturally orient themselves in water so that the head faces water and the tails face each other
Recall: Why do phospholipids orient themselves in water like they do?

4. Chapter 3: Cells
Section 3: Cell Membrane

5. Phospholipids in a Cell Membrane
Chapter 3: Cells
Section 3: Cell Membrane
Phospholipids in a Cell Membrane

6. What are some of the functions of these proteins?
Chapter 3: Cells
Section 3: Cell Membrane
The Cell Membrane
Sometimes called “fluid membrane” or “phospholipid bilayer”
Composed of a double layer of phospholipids.
Forms spontaneously because of hydrophobic/hydrophilic interactions
Has many kinds of proteins embedded in it.
What are some of the functions of these proteins?

7. Chapter 3: Cells
Section 3: Cell Membrane
The Fluid Mosaic Model

8. Very much like nuclear pores in structure and function.
Chapter 3: Cells
Section 3: Cell Membrane
Embedded proteins
Very much like nuclear pores in structure and function.
Some are channels, allowing things to pass through the membrane.
Some are receptors that receive a signal and transmit the message to the cell.

9. Journey Inside the Cell Membrane
Chapter 3: Cells
Section 3: Cell Membrane
Journey Inside the Cell Membrane