Human Phys Exam 1 F07

Human Phys Exam 1 F07 - PRINTABLE VERSION Test 1 You scored...

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PRINTABLE VERSION Test 1 You scored 66 out of 100 Question 1 Your answer is CORRECT. Which of the following is not a function of the lipid bilayer? a) Serves as a barrier to water soluble substances. b) Serves as the basic structure of the plasma membrane. c) Responsible for the fluidity of the plasma membrane. d) All of these. e) None of these. Question 2 Your answer is CORRECT. The function of the channel proteins is to: a) Provide a conduit through which specific ions can pass through the plasma membrane. b) Enables cells to bind to one another. c) Serve as a catalyst for chemical reactions. d) Is a signaling molecule through which cells communicate with one another. e) Carries polar molecules from one side of the plasma membrane to the other side. Question 3 Your answer is CORRECT. The function of the carrier proteins is: a) Provide a conduit through which specific ions can pass through the plasma membrane. b) Carries polar molecules from one side of the plasma membrane to the other side. c) Act as cellular velcro between cells. d) Serve as a catalyst for chemical reactions at the plasma membrane. e) Serve as the site of initiation for signal transduction pathways. Question 4 Your answer is INCORRECT. Carrier-mediated transport: a) Involves a specific membrane protein that serves as a carrier molecule. b) Always moves substances against a concentration gradient. c) Always requires energy expenditure. d) Both [a] and [c]. e) All of these are correct. Question 5 Your answer is CORRECT. Facilitated diffusion: a) Involves a carrier molecule. b) Does not require energy expenditure. c) Always moves substances against a concentration gradient. d) Both [a] and [b]. e) Both [a] and [c].
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Question 6 Your answer is CORRECT. If a cell were exposed to a hypotonic solution which of the following would occur? a) Water would move into the cell causing the cell to expand in volume. b) Water would move out of the cell causing the cell to shrink in volume. c) The net movement of water would be neither in nor out of the cell. Question 7 Your answer is CORRECT. Which increases the rate of diffusion for a substance through a membrane? a) Decreasing the concentration gradient. b) Increasing the molecular weight of the substance. c) Decreasing the permeability of the membrane. d) Increasing the surface area of the membrane. e) Increasing the thickness of the membrane. Question 8 Your answer is CORRECT. By osmosis, water always moves to an area of higher solute concentration. a) True b) False Question 9 Your answer is CORRECT. If there is no net diffusion is taking place between two sides of a membrane, there is movement of molecules between the two sides. a) True b) False Question 10 Your answer is CORRECT. A carrier molecule is considered to be saturated when the number of carrier molecules
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This test prep was uploaded on 04/19/2008 for the course BIOL 3324 taught by Professor Ziburkus during the Fall '07 term at University of Houston.

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Human Phys Exam 1 F07 - PRINTABLE VERSION Test 1 You scored...

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