Unformatted text preview: Lecture 5 – Movement of Molecules across a Membrane 1. Which of these statements is false? If all of the statements are true, choose f. a. In the absence of additional information, it is impossible to predict whether 25cm diameter bowling balls or 25cm diameter helium balloons located in the same electrically neutral garage will diffuse more quickly than the other through a semi-permeable garage door. b. If the random movement of molecules in each direction across the lipid bilayer of a cell is the same in both directions, the flux has reached equilibrium. c. If the random movement of molecules in each direction across the lipid bilayer of a cell is the same in both directions, there is a net flux of zero. d. All else being equal (concentration gradient, temperature, etc.) the magnitude of the flux across an 18 μm 2 cell membrane will be greater than across a 10 μm 2 cell membrane. e. A negative net flux of particles across a cell membrane indicates that all diffusion occurs from inside...
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This note was uploaded on 07/01/2008 for the course INTEGRATIV 130 taught by Professor Kregel during the Spring '08 term at University of Iowa.
- Spring '08