21. Opsin is synthesized on the rough endoplasmic reticulum and is an integral membrane protein.22. Two rhabdomeric opsins and a Go-opsin. 23. Two rhabdomeric opsins and a Go-opsin . 24. Opsins are responsible for adjusting wavelength dependence of the chromophore light induced isomerization reaction.25. Therefore, opsins act by determining chromophore sensitivity to light at any given wavelength. 26. The cattle RGR opsin absorbs maximally at different wavelengths depending on the pH-value. 27. After bacteriorhodopsin, halorhodopsin may be the best type I ( microbial ) opsin studied. 28. From translation of opsin to formation of the disks takes just a couple of hours. 29. All above assumes trichromatic vision and that the opsins all have the same action spectrum. 30. Individuals who can express only two types of opsins in the cones are called dichromats.
