6. Retinal is a conjugated chromophore that is responsible for our ability to see. Retinal is covalently bound to the protein Rhodopsin through a lysine residue. Rhodopsin NH2+ 6.1 Draw a non-enzymatic mechanism to describe the formation of the imine between retinal and lysine. For simplicity, use RNH2 to represent lysine. 6.2 During the visual cycle, retinal absorbs a photon and this leads to a conformation change. The bond between retinal and the protein is hydrolyzed and retinal is disconnected from the protein. Draw an arrow-pushing mechanism describing this hydrolysis step (remember that this is the reverse reaction for imine formation)