1. 3.3 Cell Membrane

2. Plasma Membrane Chapter 4
The boundary that separates the interior of a living cell from its surroundings
Regulates traffic into and out of the cell, allowing only certain substances to pass (selectively permeable)
Made mostly of proteins and lipids (phospholipids)
Referred to as a phospholipid bilayer

3. Phospholipid Bilayer Has 2 parts: Head Tail One Two Phosphate Lipid
Hydrophilic – attracted to water
Hydrophobic – not attracted to water
Negatively charged
Positively charged

4. Fluid Mosaic Model
Chapter 4
states that the phospholipid bilayer behaves like a fluid more than like a solid