Test 1_2010 - PRINTABLE VERSION Test 1 You scored 56 out of...

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PRINTABLE VERSION Test 1 You scored 56 out of 100 Question 1 Your answer is CORRECT. In the plasma membrane the polar ends of the phospholipid molecules are hydrophilic. a) True b) False Question 2 Your answer is CORRECT. The hydrophobic interior of the lipid bilayer of the plasma membrane blocks the passage of water-soluble substances. a) True b) False Question 3 Your answer is CORRECT. Which body fluid compartment contains higher levels of Na + , Cl - , and HCO 3 - ? a) plasma b) interstitial fluid c) intracellular fluid d) Both [a] and [c] e) Both [a] and [b] Question 4 Your answer is CORRECT. Which of the following is not a function of membrane proteins? a) bind to ligands b) regulate the passage of ions c) act as transport molecules for various solutes d) anchor or stabilize the cell membrane e) produce energy
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Question 5 Your answer is INCORRECT. The law of mass balance states a) total amount of substance X in the body = [intake + production] [excretion + metabolic removal]. 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] + [excretion - metabolic removal]. d) Both [a] and [b] e) Both [b] and [c] Question 6 Your answer is INCORRECT. When body temperature rises, a center in the brain initiates physiological changes to decrease the body temperature. This is an example of a) negative feedback. b) positive feedback. c) homeostatic regulation. d) diagnostic regulation. e) disease. Question 7 Your answer is CORRECT. Cell membranes are said to be a) impermeable. b) freely permeable. c) selectively permeable. d) actively permeable. e) none of the above Question 8 Your answer is CORRECT. When equilibrium is achieved and no net diffusion is taking place across a permeable membrane, molecules continue to move across the membrane. a) True b) False
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Question 9 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) two of these answers. e) all of these answers. Question 10 Your answer is INCORRECT. Ion movement through the membrane by way of the Na + /K + ATPase pump is an example of: a) carrier-mediated transport b) vesicular transport c) active transport d) Both [a] and [c] e) Both [b] and [c] Question 11 Your answer is CORRECT. During the movement of glucose and Na + ions via secondary active transport, the movement of a) Na + into the cell by the co-transport carrier is downhill: b) Na + into the cell by the co-transport carrier is uphill. c) glucose by the co-transport carrier is uphill. d)
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Test 1_2010 - PRINTABLE VERSION Test 1 You scored 56 out of...

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