Use the Following Information When Answering the Corresponding Question(s)

question 6

Multiple Choice

Use the following information when answering the corresponding question(s) .
Rhodopsins are light-sensitive molecules composed of a protein (opsin) and retinal (derivative of vitamin A) .Opsin is a membrane protein with several α-helical segments that loop back and forth through the plasma membrane.There are two classes of rhodopsins.According to Oded Beje,one class has relatively slow dynamics (a photocycle of approximately 0.5 second) and is well suited for light detection.The second class has faster dynamics (a photocycle of approximately 0.02 seconds) and is well suited for chemiosmosis pumping of protons or chloride ions across cell membranes.Oded Beje was the first,in September 2000,to report on a rhodopsin (proteorhodopsin) found in the domain Bacteria.[Source: O.Beje et al. ,Science 289 (2000) : 1902.]
-Sodium-potassium pumps _____.

• A)move three potassium ions and two sodium ions while producing an ATP for each cycle
• B)move two potassium ions and three sodium ions while consuming an ATP for each cycle
• C)produce ATP for cells while making the outside of cell membranes negatively charged
• D)use ATP molecules to move protons to the inner side of cell membranes

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