Question

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?a. Pfr and phytochrome

b. cytokinins and phototropins
c. auxin and Pfr
d. auxin and phytochrome

Answer 1

a. Pfr and phytochrome

Step-by-step explanation:

Phytochromes are proteins that are sensitive to light, in other words, they can detect light. They can be found in the leaves of the plant. These proteins have two forms: Pf and Pfr. Pf is an inactive form of phytochrome, that in the presence of light, turns into Pfr or the active form. Next, Pfr induces a cellular response in the plant. Therefore, Pfr and phytochrome are the molecules which can be analogous to mammalian opsins in their light-sensing ability.