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

question 16

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.]
-Cystic fibrosis (CF) is a membrane-transport disease that is caused by an allele found primarily in Caucasian populations.What mechanism fails in CF patients?

• A)production of ATP
• B)movement of sodium and potassium across cell membranes
• C)movement of chloride ions across cell membranes
• D)phospholipids in the cell membrane that are not formed properly

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