How Is the Stimulus by Light Terminated So That the Initial

question 17

Multiple Choice

How is the stimulus by light terminated so that the initial state is restored?

• A) Activated rhodopsin is blocked from activating transducin when metarhodopsin II (R*) is phosphorylated and the inhibitor arrestin binds the R*.
• B) The level of cGMP is raised to reopen the gated ion channels.
• C) The GTP bound to the G protein is hydrolyzed, allowing the transducin and the phosphodiesterase to return to their original states.
• D) All of the above.
• E) None of the answers is correct.

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