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The nutrient that can be considered both a vitamin and a hormone is vitamin


A) E.
B) K.
C) D.
D) A.

E) A) and C)
F) B) and C)

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Retinal,retinol,and retinoic acid are all forms of


A) vitamin A.
B) vitamin K.
C) vitamin D.
D) vitamin E.

E) B) and C)
F) A) and B)

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Vitamin E functions to


A) protect cell membranes from destruction by various reducing agents.
B) protect phospholipids in cell membranes from damage by free radicals.
C) accept electrons, thus neutralizing the action of free radicals.
D) All of these choices are accurate.

E) None of the above
F) B) and D)

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Excess amounts of most fat-soluble vitamins are


A) stored in the liver or adipose tissue.
B) excreted via the kidneys.
C) stored in the pancreas.
D) all of the above are correct.

E) None of the above
F) A) and B)

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A reliable food source of vitamin D is


A) yellow-orange colored fruits.
B) dark green leafy vegetables.
C) whole grain breads.
D) fortified milk.

E) None of the above
F) B) and C)

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The nutrient essential for the synthesis of blood clotting factors is vitamin


A) A.
B) D.
C) E.
D) K.

E) A) and B)
F) A) and C)

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Vitamin K deficiency is most likely to result from


A) insufficient sunlight.
B) kidney disease.
C) insufficient intake of diary products.
D) antibiotic therapy.

E) All of the above
F) A) and B)

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Beta-carotene is also called


A) provitamin
B) retinal or retinol.
C) calcitriol.
D) rhodopsin.

E) A) and D)
F) B) and C)

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Individuals with lactose intolerance or milk allergies may need calcium and vitamin D supplements.

A) True
B) False

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List 3 symptoms of vitamin A toxicity.

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Vitamin A toxicity, also known as hyperv...

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As calcium levels in the blood drop below normal,____________ is released to increase the synthesis of calcitriol.


A) calcitonin
B) thyroid hormone
C) parathyroid hormone
D) secretin

E) B) and C)
F) A) and D)

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Vitamin A deficiency can result in development of xerophthalmia in membranes of the eye.

A) True
B) False

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Rhodopsin,the visual pigment in the retina of the eye,is regenerated when opsin combines with


A) retinoic acid.
B) 11-cis retinal.
C) 13-cis-retinol.
D) beta-carotene.

E) B) and D)
F) B) and C)

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Vitamin A deficiency is characterized by the


A) inability to produce insulin.
B) failure to form blood clots.
C) inability to adapt quickly to changes in light intensity.
D) production of excessive amounts of collagen.

E) None of the above
F) C) and D)

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A primary function of vitamin E is to serve as


A) a coenzyme.
B) an antioxidant.
C) a hormone.
D) a peroxide.

E) A) and C)
F) None of the above

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Mucus-forming cells in the body deteriorate and can no longer produce mucus when there is a deficiency of


A) vitamin D.
B) beta-carotene.
C) vitamin K.
D) vitamin A.

E) None of the above
F) B) and D)

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In children,a severe deficiency of vitamin A often results in


A) scurvy.
B) night blindness.
C) insufficient blood clotting.
D) microcytic anemia.

E) B) and C)
F) A) and C)

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The yellow-orange coloring of carotenoid-rich dark green vegetables is masked by the pigment


A) lycopene.
B) chlorophyll.
C) beta-carotene.
D) alpha-carotene.

E) B) and D)
F) A) and D)

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Of the following population groups,those at lowest risk for vitamin E deficiency are


A) premature infants.
B) the elderly.
C) athletes.
D) smokers.

E) B) and D)
F) A) and D)

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Children eating large amounts of carrots can develop


A) hyperactivity.
B) hypercarotenemia.
C) hyperglycemia.
D) vitamin A toxicity.

E) None of the above
F) All of the above

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