Amino acids are essential (and important) to the body for all the following except:

a. Production of some hormones

b. Production of antibodies

c. Formation of most structural materials

d. As a source of quick energy

List some factors that influence plasma cholesterol levels. Also list the sources and fates of cholesterol in the body.

How do fat-soluble and water-soluble vitamins differ? Which vitamins are fat-soluble?