Question

Determine whether each role in the eye is played by opsin, crystallin, or both.

Opsin Crystallin Both crystallin and opsin stimulated by light to emit an electrical signal to the brain bends light to focus an image on the retina maintains protein configuration under stress differs substantially between vertebrate and invertebrate lineages forms the lens of the eye evolved from duplicated genes with different functions Answer Bank

Answer 1

Opsin	Crystallin	Both Opsin and Crystallin
It is stimulated by light to emit an electrical signal to the brain which is first visual transduction pathway.	Maintains protein configuration under stress. Upon stress $\alpha \beta$ Crystallin dissociates from the filaments to interact with unfolding $\beta/\gamma$ crystallin to protect against aggregation and loss of transparency	Evolved from duplicated genes with different functions
	It bends light to focus an image on the retina known as refraction and it is present behind the iris	Differs substantially between vertebrate and invertebrate lineages because though it is present in both vertebrates and invertebrate they differ in the sequence of proteins
	Forms the lens of the eye in different vertebrates with $\alpha$ and $\beta \gamma$ crystalline