TLS Online TPP Program

#Question id: 1242


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?

#Unit 4. Cell Communication and Cell Signaling
  1. Rhodopsin phosphatase increases the degree of rhodopsin phosphorylation.

  2. Arrestin binds to the completely phosphorylated opsin to inhibit signaling.

  3. Rhodopsin activation promotes the opening of a cGMP-gated ion channel.

  4. Arrestin binds to the completely dephosphorylated opsin to inhibit signaling.