Which of the following statements accurately describes vitamin A’s role in 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 vitamin A and the protein elastin.
e. Retinol protects the visual cortex from teratogenic chemicals.
Answer: B
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