Rhodopsin,a Light-Sensitive GPCR Whose Role in Vision Is Dependent on Its

question 41

Multiple Choice

Rhodopsin,a light-sensitive GPCR whose role in vision is dependent on its phosphorylation status,is influenced in part by the protein arrestin.Which of the following is TRUE with regard to rhodopsin and vision?

• A)Rhodopsin phosphatase increases the degree of rhodopsin phosphorylation.
• B)Arrestin binds to the completely phosphorylated opsin to inhibit signaling.
• C)Rhodopsin activation promotes the opening of a cGMP-gated ion channel.
• D)none of the above

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