01:119:115 Lecture Notes - Lecture 6: Passive Transport, Lipid Bilayer, Protein C
27 Sep 2016
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C. 2. b) integral - deeply inserted transmembrane - spans protein (c. 2. b. 1) (c. 2. b. 2) hydrophobic regions (c. 2. b. 3) hydrophilic regions associate with head regions of membrane (c. 2. b. 4) C. 2. c) peripheral - not embedded (c. 2. c. 1) hydrophilic (c. 2. c. 2) located outside of membrane. C. 3. a) some held in place by cytoskeleton (c. 3. a. 1) network of fibers in cytoplasm. C. 3. c) others move only laterally within a single layer cannot flip-flop between layers because of conflicting hydrophobic/ hydrophilic layers. C. 3. d) functions of membrane proteins (c. 3. d. 1: carbohydrates. A. 2. b) passive (a. 2. b. 1) substances diffuse spontaneously down their concentration gradients crossing a membrane with no expenditure of energy by the cell (a. 2. b. 2) (a. 2. b. 3) energy concentration gradient cell does not expend metabolic/its own energy. Active (a. 2. c. 1) metabolic energy: diffusion - simplest transport passive (a. 2. c. 2) Hydrophobic molecules and very small uncharged polar molecules can diffuse through the lipid bilayer. B. 2. tendency for molecules of any substance to spread out in available space.
