Which of the following describes an association between vitamin A and vision?
a. Retinoic acid is the form required for synthesis of retinoblasts.
b. Light causes retinal to shift from a cis to a trans configuration.
c. Retinol is the form bound to beta-carotene in the corneal membrane.
d. Pigment molecules in the retina are composed of a molecule of vitamin A bound to an omega-3 fatty acid.
e. Retinol protects the visual cortex from teratogenic chemicals.
ANS: B
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