MULTIPLE CHOICE

1.Approximately what percentage of Canadians fails to consume the recommended number of fruits and vegetables?

a.50 percent

b.55 percent

c.60 percent

d.65 percent

2.What is the name of an atom with an unpaired electron?

a.free atom

b.radical electron

c.free radical

d.radical electron

3.Which vitamin works with vitamin A to protect the body’s cells from oxidative damage?

a.C

b.B₁₂

c.D

d.E

4.Which of the following tissues can use precursor vitamin A to form vitamin A?

a.pancreatic cells

b.red blood cells

c.adipose cells

d.intestinal cells

5.Which of the following food substances can be converted to vitamin A in the body?

a.tryptophan

b.chlorophyll

c.xanthophyll

d.beta-carotene

6.How many different forms of vitamin A are active in the body?

a.1

b.2

c.3

d.5

7.Which of the following is a form of vitamin A?

a.retinol

b.cortisol

c.beta-carotinol

d.retinoquinone

8.Which of the following is responsible for transporting vitamin A from the liver to other tissues?

a.albumin

b.rhodopsin

c.retinol-binding protein

d.transcarotenoid protein

9.How many million molecules of vitamin a-containing visual pigments are found in the retina?

a.30

b.40

c.50

d.60

10.What are the known effects of raising animals on diets containing retinoic acid as the only source of vitamin A?

a.Growth is stunted.

b.Blindness develops.

c.Retinal synthesis is stimulated

d.Retinol synthesis is stimulated.