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

question 26

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.]
-GLUT-1 is an example of what?

• A)a membrane-bound pump that moves large molecules against a gradient by using ATP
• B)a protein that is toxic to cells by opening channels in membranes
• C)a recognition protein that identifies cells as belonging to the body
• D)a transport protein that facilitates diffusion of a large molecule across cell membranes

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