Problem 43
List the fat-soluble vitamins, and give a physiological role for each.
Problem 44
What is the role in vision of the cis-trans isomerization of retinal?
Problem 52
What are the main structural features of prostaglandins?
Problem 53
List two classes of compounds derived from arachidonic acid. Suggest some reasons for the amount of biomedical research devoted to these compounds.
