easy · MCAT bio-biochem

In the human eye, the process of phototransduction is initiated when light strikes a rod cell.

Which chemical event specifically triggers the biological signal?

  1. All-trans retinal is isomerized to 11-cis retinal.
  2. Rhodopsin is phosphorylated to its inactive state.
  3. Retinal is converted into Vitamin A directly.
  4. 11-cis retinal is isomerized to all-trans retinal.

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