medium · MCAT bio-biochem
During the phototransduction cascade in the human eye, what specific molecular change occurs to retinal upon the absorption of a photon?
- Isomerization from all-trans-retinal to 11-cis-retinal
- Oxidation of retinal to retinoic acid
- Isomerization from 11-cis-retinal to all-trans-retinal
- Dissociation of retinal from the opsin protein without structural change
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