Fall 09 - Your answer is CORRECT. The contemporary model...

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Your answer is CORRECT. The contemporary model for cell membrane structure is called a) the double layer. b) the butter sandwich. c) the fluid mosaic. d) the phospholipid mosaic. e) the plasmalemma. Question 2 Your answer is INCORRECT. What is/are the major role(s) of the phospholipid bilayer? a) the absorption of fats b) the formation of a barrier that is selectively permeable to lipid-soluble molecules c) to provide a framework for membrane proteins d) to carry water-soluble molecules through a hydrophobic environment e) Both [b] and [c] Question 3 Your answer is CORRECT. Plasma is a) within the circulatory system. b) the fluid portion of blood. c) a subdivision of the ECF. d) two of these e) all of the above Question 4 Your answer is CORRECT. Receptor sites on the outer surface of the plasma membrane are: a) ATP. b) carbohydrates. c) cyclic AMP. d) DNA. e) proteins. Question 5 Your answer is INCORRECT. The law of mass balance states a) total amount of substance X in the body = intake + production - output. b) if the amount of a substance in the body is to remain equal, any loss must be offset by an equal gain. c) total amount of substance X in the body = intake - production - output. d) e) Question 6 Your answer is CORRECT. Homeostasis is a) the principle of mass balance. b) a relatively constant internal environment. c) a state of equilibrium.
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d) the load of a substance in the body. Question 7 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 8 Your answer is INCORRECT. A cell membrane that is selectively permeable a) randomly chooses which substances will pass through. b) can change which substances pass through by changing its lipid and protein content. c) is impermeable to all substances but water. d) will only allow substances in or out if their concentration in the cell is above or below a certain point. Question 9 Your answer is CORRECT. Which of the following pairs of molecular characteristics favors diffusion through the cell membrane? a) large, polar b) large, non-polar c) small, polar d) small, non-polar Question 10 Your answer is CORRECT. Facilitated diffusion: a) involves a carrier molecule. b) requires energy expenditure. c) is how glucose enters the cells. d)
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This note was uploaded on 07/27/2011 for the course BIOL 3324 taught by Professor Ziburkus during the Fall '07 term at University of Houston.

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Fall 09 - Your answer is CORRECT. The contemporary model...

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