human physio exam 1 spring 09

human physio exam 1 spring 09 - PRINTABLE VERSION Test 1...

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PRINTABLE VERSION Test 1 You scored 72 out of 100 Question 1 Your answer is INCORRECT. Which statement regarding membrane proteins is incorrect? a) Channels are water-filled pathways. b) Channels maybe highly selective. c) Membrane proteins may catalyze specific reactions. d) CAMs are a type of receptor protein. e) Proteins may act as recognition markers. Question 2 Your answer is CORRECT. Which decreases the rate of diffusion for a substance through a membrane? a) increasing the concentration gradient. b) increasing the molecular weight of the substance. c) increasing the permeability of the membrane. d) increasing the surface area of the membrane. e) opening the channels in the membrane. Question 3 Your answer is CORRECT. Which of the following descriptions of movement of molecules across the plasma membrane is correct? a) If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other. b) In simple diffusion, the rate of transport of a molecule is directly proportional to the molecule's extracellular concentration. c) When a carrier becomes saturated, the maximum rate of transport is reached. d) Two of these answers. e) All of these answers. Question 4 Your answer is CORRECT. Carrier-mediated transport: a) involves a specific membrane protein that serves as a carrier molecule. b) always moves substances against a concentration gradient.
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c) always requires energy expenditure. d) two of these answers. e) all of these answers. Question 5 Your answer is CORRECT. The normal saline concentration of the body is 0.9%. If a typical body cell is placed in pure water, the cell: a) will fill with water until equilibrium is reached. b) will fill with water and eventually lyse. c) will lose water. d) will remain unchanged. e) none of these answers. Question 6 Your answer is INCORRECT. Which of the following is incorrect? a) Endocytosis provides a way to add specific components to the plasma membrane. b) Phagocytosis refers to the endocytosis of large multi-molecular particles such as bacteria or cellular debris. c) By means of endocytosis, a particle can gain entry to the interior of the cell without actually passing through the plasma membrane. d) Endocytosis can be triggered by the binding of a particle to a receptor site on the plasma membrane. e) The endocytotic vesicle may be degraded by lysosomes within the cell. Question 7 Your answer is CORRECT. Assuming a membrane is only water soluble and there is no significant hydrostatic pressure, water will osmose from: a) an isotonic solution to a hypotonic solution. b) a hypotonic solution to a hypertonic solution. c) a hypertonic solution to a hypotonic solution. d)
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This note was uploaded on 01/05/2012 for the course CHEM 3321 taught by Professor Bean during the Spring '11 term at American Jewish University.

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human physio exam 1 spring 09 - PRINTABLE VERSION Test 1...

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