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This 2 page Class Notes was uploaded by Leopoldo Larson on Saturday September 19, 2015. The Class Notes belongs to BISC207 at University of Delaware taught by VictorFomin in Fall. Since its upload, it has received 11 views. For similar materials see /class/207096/bisc207-university-of-delaware in Biological Sciences at University of Delaware.
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Date Created: 09/19/15
Bio Exam 3 Review Chapter 5 Membrane Structure Synthesis and Transport Phospholipids have hydrophobic tail that will interact with other non polar tails but not water or aqueous solutions Endocytosis vesicular movement of material into the cell Exocytosis 7 vesicular movement of material to the exterior of the cell Three primary components of a membrane 0 Phospholipids 0 Proteins o Carbohydrates Cells must import Glucose and Amino Acids What is one way that solutes that cannot diffuse across the membrane can still gain access to the interior cell 0 Transport Proteins The sodiumpotassium 7ATPase pump actively transports Na and K ions against their gradients by using the energy from ATP hydrolysis Arrange the solutes that are listed according to a phospholipid bilayer s permeability to them beginning with the lowest permeability Amino Acids 000 m s cm 32 V 0 Carbon dioxide To move a substance against a concentration gradient the following is necessary 0 A source of energy 0 A transport protein 0 A membrane Hypotonic solution 7the solute concentration outside the cell is lower than the solute concentration inside the cell Isotonic solution 7 The solute concentration outside a cell is equal to the solute concentration inside the cell Hypertonic solution 7 the solute concentration outside a cell is higher than the solute concentration inside the cell Primary active transp01t involves a pump that uses energy to transport solutes against a gradient The chemical composition of membranes may vary because of differences in o Phospholipid components 0 Carbohydrate components 0 Protein components When comparing simple and facilitated diffusion 0 Both simple and facilitated diffusion require concentration gradients o Facilitated diffusion but not simple diffusion requires a transport protein Exocytosis is characterized by packaging material into vesicles and then excreting them into the extracellular environment An electrochemical gradient occurs in solutions that have a net charge The presence of a double bond in phospholipid tail makes the membrane more uid because it prevents phospholipids from packing so tightly Moving a solute from areas of low concentration to high concentration requires an input of energy Every amino acid the building block of proteins can be ranked according to its tendency to be soluble in a 39 J 39 or 11 39 r39 quot39 39