easy · MCAT bio-biochem
A researcher is studying the molecular basis of vision. When a photon is absorbed by the pigment retinal within a rhodopsin molecule, which specific chemical transformation initiates the G-protein-coupled-receptor cascade?
- Hydrolysis of a peptide bond within the opsin protein scaffold.
- Direct phosphorylation of retinal by an ATP-dependent kinase.
- Isomerization of retinal from the all-trans form to the 11-cis form.
- Isomerization of retinal from the 11-cis form to the all-trans form.
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