36 - spring 36, 37, 38, 39: 36 Multiple Choice Identify the...

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spring 36, 37, 38, 39: 36 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following is not a function of the plasma membrane proton pump? a. hydrolyzes ATP b. produces a proton gradient c. generates a membrane potential d. equalizes the charge on each side of a membrane e. stores potential energy on one side of a membrane ____ 2. Which of the following is an example of osmosis? a. flow of water out of a cell b. pumping of water into a cell c. flow of water between cells d. both A and B e. both A and C ____ 3. Which of the following is true concerning the water potential of a plant cell? a. It is higher than that of air. b. It is equal to zero when the cell is in pure water and is turgid. c. It is equal to 0.23 MPa. d. It becomes higher when K + is actively moved into the cell. e. It becomes lower after the uptake of water by osmosis. ____ 4. Your laboratory partner has an open beaker of pure water. By definition, the water potential ( ) of this water is a. not meaningful, because it is an open beaker and not plant tissue. b. a negative number set by the volume of the beaker. c. a positive number set by the volume of the beaker. d. equal to the atmospheric pressure. e. zero. ____ 5. Which of the following has an effect on water potential ( ) in plants? a. air pressure b. water-attracting matrices c. dissolved solutes d. A and C only e. A, B, and C ____ 6. The value for in root tissue was found to be -0.15 MPa. If you take the root tissue and place it in a 0.1 M solution of sucrose ( = -0.23), net water flow would a. be from the tissue into the sucrose solution. b.
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36 - spring 36, 37, 38, 39: 36 Multiple Choice Identify the...

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