medium · MCAT bio-biochem
A patient with chronic vitamin A deficiency suffers from night blindness. This occurs because the protein rhodopsin cannot be regenerated.
Which chemical transition in the retinal cofactor is triggered by a photon to initiate the visual signal?
- All-trans-retinal to 11-cis-retinal
- 11-cis-retinal to all-trans-retinal
- Retinol to retinal via oxidation
- Retinal to opsin via covalent bonding
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