cell membrane bio

1 Division Ave High School Ms. Foglia AP Biology AP Biology Cell Membrane AP Biology Overview ?? Cell membrane separates living cell from nonliving surroundings ?? thin barrier = 8nm thick ?? Controls traffic in & out of the cell ?? selectively permeable ?? allows some substances to cross more easily than others ?? hydrophobic vs hydrophilic ?? Made of phospholipids, proteins & other macromolecules AP Biology Phospholipids Fatty acid Phosphate ?? Fatty acid tails ?? hydrophobic ?? Phosphate group head ?? hydrophilic ?? Arranged as a bilayer Aaaah, one of those structure?function examples AP Biology Phospholipid bilayer polar hydrophilic heads nonpolar hydrophobic tails polar hydrophilic heads AP Biology