BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Rhodopsin is a G-protein coupled receptor, and is the most abundant protein in the rod cells found in the retina (Figure 1). It functions as the primary photoreceptor molecule of vision, and contains two parts: an opsin molecule linked to a chromophore, 11-cis-retinal (Athanasiou et al., 2018).

Detailed explanation-2: -Binding of opsin to retinal (a chromophore) makes rhodopsin which serves as a visual purple pigment of rod cells. Bright light causes breakdown of rhodopsin into opsin and retinal thereby making it bleach out.

Detailed explanation-3: -Rhodopsin mediates dim light vision and thus is extremely sensitive to light. When rhodopsin is exposed to light, it immediately photobleaches. In humans, it is regenerated fully in about 30 minutes, after which the rods are more sensitive.

Detailed explanation-4: -Rhodopsin is a biological pigment found in the rods of the retina and is a G-protein-coupled receptor (GPCR). Rhodopsin is extremely sensitive to light, and thus enables vision in low-light conditions.