easy · MCAT bio-biochem
A researcher studying the molecular basis of vision analyzes the chemical changes in the retina upon exposure to light.
Which specific molecular transition initiates the signal transduction cascade in the photoreceptor cell?
- Phosphorylation of rhodopsin by ATP
- Oxidation of an alcohol group to an aldehyde
- Isomerization of 11-cis-retinal to all-trans-retinal
- Isomerization of all-trans-retinal to 11-cis-retinal
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