5. Beta-carotene is called provitamin A, meaning it is: stored as is by the liver. more…

5. Beta-carotene is called provitamin A, meaning it is: stored as is by the liver. more bioavailable than preformed vitamin A the synthetic form of vitamin A, used to fortify foods and supplements, an inactive, precursor form of vitamin A 1. Rhodopsin is formed when: cis-retinal combines with opsin. beta-carotene is converted to rhodopsin. cis-retinal is converted to rhodopsin when light hits the rod cell. trans-retinal combines with opsin. 2. The difference between cis-retinal and trans-retinal is: cis-retinal is straight, whereas trans-retinal is bent. they combine with opsin at different sites. they have different conformations of double-bonds. @ cis-retinal is more efficiently paired with opsin than trans-retinal. 3. Vitamin A deficiency leads to night blindness because: the rod cells are less protected from UV radiation from sunlight. cis-retinal cannot be converted to trans-retinal. there is a less efficient response to recharge rhodopsin. the nerve impulse to the brain is delayed. 4. The dish that has the best potential to reverse night blindness is: 1 cup whole milk. 12 cup brown rice. 3-ounce serving of chicken liver with antons. V2 cup cooked carrots