1. Cell Membrane Structure and Function

2. Membrane Design fluid-mosaic model a. Fluid = pliable/easily moved
Cell Membrane Animation
fluid-mosaic model
a. Fluid = pliable/easily moved
b. Mosaic = made of many different
molecules (lipids, proteins, carbohydrates)

3. Selectively Permeable
Predict the two reasons things can’t directly go through the membrane:
Size (duh)
Polarity (from last unit)

4. Selectively Permeable
The cell membrane only lets certain substances in and out of the cell

5. Phosopholipid Bi-Layer
-polar heads are hydrophilic “water loving” -tails (fatty acids) are hydrophobic “water fearing” and face inward

6. Cholesterol Type of steroid (lipid) Changes fluidity of cell membrane
Higher temps – stiffens membrane
Lower temps – prevents membrane from freezing

7. Proteins Recognition Proteins Receptor Proteins
Proteins that have carbohydrate chains attached
Carbohydrate chains aid in cell identification
“Name Tags”
Example: Red Blood Cells (A, B), Identify Viruses as foreign
Receptor Proteins
Proteins that receive chemical signals from other cells
Such as nervous system cells

8. Proteins Channel Proteins
Proteins that involved in letting certain substances in and out of cells
Aquaporins- let water in and out of cells

9. Proteins Integral Peripheral
Proteins that cross both layers of the phosphoplipid bilayer
Peripheral
proteins that are only on the top half or bottom half of the phospholipid bilayer