51.Which of the following is a chronic symptom for vitamin A?

a.headaches

b.reduced bone density

c.muscle incoordination

d.vertigo

52.Which of the following provides the least amount of precursor vitamin A?

a.corn

b.spinach

c.carrots

d.cantaloupe

53.Recently, there has been a lot of news about the importance of antioxidants in the diet. Which of the following vitamins has been noted as preventing the oxidation of low-density lipoproteins?

a.vitamin A

b.vitamin E

c.vitamin K

d.vitamin D

54.What is the main function of vitamin E in the body?

a.acts as a peroxide

b.acts as a coenzyme

c.acts as an antioxidant

d.acts as a free radical

55.What is the role of vitamin E in the metabolism of free radicals?

a.carrier

b.promoter

c.eliminator

d.synthesizer

56.Which of the following features do vitamins C and E share?

a.Both function as antioxidants.

b.Both require bile for absorption.

c.Neither participates in protein synthesis.

d.Neither is affected by the processing of foods.

57.How is vitamin E thought to play a role in reducing the risk of heart disease?

a.It inhibits absorption of dietary cholesterol.

b.It slows oxidation of low-density lipoproteins.

c.It interferes with cholesterol synthesis by the liver.

d.It speeds removal of blood cholesterol by the liver.

58.The major function of vitamin E is to inhibit the destruction of which of the following?

a.lysosomes

b.free radicals

c.mucopolysaccharides

d.polyunsaturated fatty acids

59.What form of tocopherol shows vitamin E activity in the human body?

a.alpha

b.beta

c.gamma

d.delta

60.Which one of the following organs regulates vitamin E concentrations?

a.heart

b.kidneys

c.liver

d.pancreas