Practice Quiz 2

Practice Quiz 2 - Question 1 2 of 2 points Diffusion is...

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Question 1 2 of 2 points Diffusion is defined as Selected Answer: the random movement of molecules due to their heat energy resulting in an equal distribution of the molecules. Correct Answer: the random movement of molecules due to their heat energy resulting in an equal distribution of the molecules. Question 2 0 of 2 points Assume that a sodium chloride solution in placed in a membrane bound bag and the bag is then placed in a container that contains a different sodium chloride solution. The membrane of the bag is permeable to sodium ions but not to chloride ions. The concentration of the sodium chloride solution in the bag is much higher than the concentration of the sodium chloride solution in the container. Which of the following ion movements will occur? Selected Answer: Sodium ions will move until its concentration gradient is dissipated (i.e., until the concentration of sodium ions in the bag is the same as the concentration of sodium ions in the container. Correct Answer: A membrane potential, negative on the inside of the membrane (inside the bag), will develop.
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Question 3 2 of 8 points The illustration below demonstrates the pattern of transport of a type of molecule from the extracellular fluid (ECF) across the cell membrane into the intracellular fluid (ICF). Match the process or characteristic listed below with the correct curve (Curve A or Curve B) shown in the illustration. Question Correct Match Selected Match Active transport B. Curve B A. Curve A ATP dependent B. Curve B C. No match Facilitated diffusion B. Curve B B. Curve B Simple diffusion A. Curve A B. Curve B Question 4 0 of 2 points
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A physiologist observes that the concentration of sodium ions inside a cell is decidedly lower than that outside the cell. Yet sodium ions do diffuse easily across the plasma membrane of such cells, and the ions accumulate in the cells when they are dead but not when they are alive. Which of the following terms applies best to the cellular function that is lacking in dead cells? Selected Answer: Osmosis Correct Answer: Active transport Question 5 2 of 2 points In the four cases (A, B, C and D), the concentrations of solute X in four one liter compartments (Compartment 1) are separated from four other one liter compartments (Compartment 2) by a membrane through which X can diffuse are shown in the table below. Based on those data, which of the following statements is correct? Selected Answer: In Case A and Case C, there will be net movement of X from Compartment 2 to Compartment 1 while there will be net movement of X from Compartment 1 to Compartment 2 in Case B. There will be no net movement of X in Case D.
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This note was uploaded on 05/02/2011 for the course BIOL 2051 taught by Professor Brininstool during the Spring '07 term at LSU.

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Practice Quiz 2 - Question 1 2 of 2 points Diffusion is...

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