Question 1

Vitamin E deficiency causes xerophthalmia, irreversible blindness due to hardening of the cornea.

Accepted Answer

A) True 
 B)False

Question 2

Carrots, spinach, and sweet potatoes contain a large amount of preformed vitamin A.

Accepted Answer

A) True 
 B)False

Question 3

Results of the Beta-Carotene and Retinol Efficacy Trial (CARET) indicated a higher incidence of lung cancer among those who took beta-carotene and retinol supplements.

Accepted Answer

A) True 
 B)False

Question 4

As beta carotene is not considered a nutrient, no RDA has been established.

Accepted Answer

A) True 
 B)False

Question 5

Diseases that cause malabsorption of fat can result in a vitamin C deficiency.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements is FALSE concerning vitamin C?

Accepted Answer

A)  Vitamin C is also known as ascorbic acid.
B)  Vitamin C acts as an antioxidant that may help to reduce the risk of chronic diseases.
C)  Vitamin C helps the immune system by enabling the body to make white blood cells.
D)  Smokers should consume less vitamin C than non-smokers.E) A) and D)
F) B) and D)

Question 7

A chemical reaction in which atoms lose electrons is

Accepted Answer

A)  oxidation.
B)  reduction.
C)  radiation.
D)  mineralization.E) B) and C)
F) A) and C)

Question 8

Which of the following hormones requires selenium for its synthesis?

Accepted Answer

A)  estrogen
B)  insulin
C)  cortisol
D)  thyroxineE) A) and C)
F) A) and B)

Question 9

The smallest physical units of a substance are

Accepted Answer

A)  molecules.
B)  atoms.
C)  free radicals.
D)  elements.E) C) and D)
F) B) and D)

Question 10

MOST of the body's vitamin A is stored in the

Accepted Answer

A)  liver.
B)  pancreas.
C)  spleen.
D)  large intestine.E) A) and B)
F) A) and C)

Question 11

Which of the following cooking methods will likely destroy the MOST vitamin C in food?

Accepted Answer

A)  stir-frying
B)  microwaving
C)  steaming
D)  boilingE) A) and D)
F) None of the above

Question 12

Guinea pigs and humans are two groups that cannot synthesize their own vitamin C and must consume it in their diet.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following statements is FALSE regarding the mineral selenium?

Accepted Answer

A)  Most selenium in our bodies is contained within two amino acid derivatives.
B)  Selenium is involved in the maintenance of basal metabolism and body temperature.
C)  Selenium is present only in foods of animal origin.
D)  Selenium is a component of the glutathione peroxidase antioxidant enzyme system.E) A) and D)
F) A) and C)

Question 14

A vitamin A deficiency can cause night blindness.

Accepted Answer

A) True 
 B)False

Question 15

Consuming even moderately excessive doses of vitamin C supplements would be MOST harmful to individuals suffering from

Accepted Answer

A)  scurvy.
B)  diabetes mellitus.
C)  hemochromatosis.
D)  Keshan disease.E) None of the above
F) B) and C)

Question 16

What kind of reaction results in an atom gaining electrons?

Accepted Answer

A)  oxidation reaction
B)  reduction reaction
C)  promotion reaction
D)  radical reactionE) C) and D)
F) A) and D)

Question 17

Ninety percent of the vitamin A we absorb is stored in adipose tissue.

Accepted Answer

A) True 
 B)False

Question 18

Beta-carotene is a precursor of

Accepted Answer

A)  retinol.
B)  alpha-tocopherol.
C)  zeaxanthin.
D)  ascorbic acid.E) A) and B)
F) B) and C)

Question 19

How do antioxidant minerals stabilize free radicals?

Accepted Answer

A)  donate electrons or hydrogens
B)  enzymatic destruction
C)  phagocytosis
D)  break down oxidized fatty acidsE) B) and C)
F) C) and D)

Question 20

The light-sensitive pigment found in rod cells and formed by retinal and opsin is

Accepted Answer

A)  chlorophyll.
B)  lutein.
C)  rhodopsin.
D)  tocotrienal.E) A) and B)
F) A) and C)

Exam 8: Nutrients Involved in Antioxidant Function

Which of the following statements is FALSE regarding the mineral selenium?

Correct AnswerverifiedShow Answer

What kind of reaction results in an atom gaining electrons?

Correct AnswerverifiedShow Answer

Which of the following cooking methods will likely destroy the MOST vitamin C in food?

Correct AnswerverifiedShow Answer

Guinea pigs and humans are two groups that cannot synthesize their own vitamin C and must consume it in their diet.

Correct AnswerverifiedShow Answer

As beta carotene is not considered a nutrient, no RDA has been established.

Correct AnswerverifiedShow Answer

A vitamin A deficiency can cause night blindness.

Correct AnswerverifiedShow Answer

Diseases that cause malabsorption of fat can result in a vitamin C deficiency.

Correct AnswerverifiedShow Answer

The smallest physical units of a substance are

Correct AnswerverifiedShow Answer

Consuming even moderately excessive doses of vitamin C supplements would be MOST harmful to individuals suffering from

Correct AnswerverifiedShow Answer

MOST of the body's vitamin A is stored in the

Correct AnswerverifiedShow Answer

The light-sensitive pigment found in rod cells and formed by retinal and opsin is

Correct AnswerverifiedShow Answer

Results of the Beta-Carotene and Retinol Efficacy Trial (CARET) indicated a higher incidence of lung cancer among those who took beta-carotene and retinol supplements.

Correct AnswerverifiedShow Answer

Beta-carotene is a precursor of

Correct AnswerverifiedShow Answer

Ninety percent of the vitamin A we absorb is stored in adipose tissue.

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE concerning vitamin C?

Correct AnswerverifiedShow Answer

A chemical reaction in which atoms lose electrons is

Correct AnswerverifiedShow Answer

Which of the following hormones requires selenium for its synthesis?

Correct AnswerverifiedShow Answer

Carrots, spinach, and sweet potatoes contain a large amount of preformed vitamin A.

Correct AnswerverifiedShow Answer

How do antioxidant minerals stabilize free radicals?

Correct AnswerverifiedShow Answer

Vitamin E deficiency causes xerophthalmia, irreversible blindness due to hardening of the cornea.

Correct AnswerverifiedShow Answer

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