The light -absorbing portion of the photopigment is_________ ; its sensitivity to a particular wavelength of light is altered by _________.
A) opsin : retinal
B) phosphodiesterase : transducin
C) opsin : transducin
D) transducin : phosphodiesterase
E) retinal : opsin

Question

Quizplus · Accepted Answer

The light-absorbing portion of the photopigment is retinal, and its sensitivity to a particular wavelength of light is altered by opsin. Retinal is the molecule that actually absorbs photons, and opsin is the protein component that determines the specific wavelength of light to which the photopigment is most sensitive.

The Light -Absorbing Portion of the Photopigment Is_________ ; Its