How Does Bacteriorhodopsin Couple Photoexcitation with Proton Pumping

question 37

Multiple Choice

How does bacteriorhodopsin couple photoexcitation with proton pumping?

• A) Bacteriorhodopsin has a proton channel domain.
• B) Bacteriorhodopsin makes the membrane porous to protons.
• C) Light-induced conformational changes of retinal cause the protein to extrude one proton.
• D) All of the above.
• E) None of the above.

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