Mammalian eyes sense light because they contain cells having molecules called opsins,which change structure when exposed to light.Which of the following plant molecule(s)would be analogous to mammalian opsins in their light-sensing ability?

Question

Quizplus · Accepted Answer

Pfᵣ (phytochrome) and phototropins are both plant molecules that can sense light. Phytochrome is a red/far-red light receptor and phototropins are blue light receptors. Both of these molecules undergo structural changes when exposed to light, similar to how opsins function in mammalian eyes. Auxin and cytokinins are plant hormones that do not have a direct light-sensing ability, and ABA (abscisic acid) is involved in plant stress responses and growth regulation, but not in light sensing.

Mammalian Eyes Sense Light Because They Contain Cells Having Molecules