1. Notes on
The Cell Membrane

2. Purposes: Holds cell together Provides protection
Controls movement in and out of a cell
Selectively permeable – some substances can pass through, others cannot
Permeable to O2, H2O, CO2
Not permeable to large molecules (glucose, lipids, amino acids) and salt

3. Structure 2 layers of molecules (bilayer) Made of phospholipids
Hydrophilic heads touch water
Hydrophobic tails touch each other
Proteins studded throughout the bilayer
Make pores to let things in and out

4. The phospholipid bilayer
Hydrophilic heads touch water
Hydrophobic tails touch each other

6. At the bottom of your notes,
Write a 1 paragraph summary: what does the cell membrane look like?