Nutrition 9

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bobbie2013
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Nutrition 9
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2010-08-04 16:02:06
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NUTR 330
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  1. Fat-soluble vitamins are not

    a) present in fatty or oily portions of foods

    b) absorbed directly into the bloodstream through the intestinal mucosal cells

    c) dependent on protein carriers for transport

    d) deposited in the liver and other body tissues if consumed in excess
    b) absorbed directly into the bloodstream through the intestinal mucosal cells
  2. Retinol is

    a) found in foods of plant origin

    b) the form of vitamin A which functions in the visual process

    c) the alcohol form of vitamin A

    d) the form in which vitamin A is stored in the body
    c) the alcohol form of vitamin A
  3. Vitamin A is present in animal foods and body storage as

    a) retinyl esters

    b) retinol

    c) retinal

    d) beta-carotene
    a) retinyl esters
  4. The form of vitamin A involved in the visual process is ___________
    -retinal
  5. The form of vitamin A that is involved in cellular differentiation is ____________
    -retinoic acid
  6. True/False (support your answer with an explanation)

    Night vision is maintained by iodopsin, the light-sensitive pigment of the cones in the retina
    False

    Night vision is maintained by rhodopsin, the light-sensitive pigment of the rods in the retina
  7. The greatest deman for vitamin A is for

    a) the visual process

    b) epithelial tissue development and maintenance

    c) immunity

    d) growth and bone development
    b) epithelial tissue development and maintenance
  8. True/False (support your answer with an explanation)

    Vitamin A is involved in the reaborption of old bone during bone development
    -True
  9. Children in developing countries often become blind because

    a) of the high rate of infection

    b) of a lack of retinoic acid

    c) of vitamin A toxicity

    d) protein and zinc deficiencies interfere with the utilization and transport of vitamin A, and intake of all three nutrients is deficient
    d) protein and zinc deficiencies interfere with the utilization and transport of vitamin A, and intake of all three nutrients is deficient
  10. In developed countries, vitamin A deficiency is caused mainly by

    a) inadequate intake of fruits and vegetables

    b) protein-calorie malnutrition

    c) malabsorption of fat

    d) inadequate intake of liver
    c) malabsorption of fat
  11. True/False (support your answer with an explanation)

    Vitamin A supplements are effective in the treatment of acne
    False

    Only retinoic acid form of vitamin A has been proven effective for the treatment of acne. Vitamin A in supplements is normally in the form of retinol
  12. Vitamin A toxicity may occur

    a) when large quantities of carrots are consumed daily

    b) when a vitamin A supplement that exceeds the RDA by five to ten times is used daily for several months

    c) if liver is consumed once a week

    d) if two litres of vitamin A fortified milk are consumed daily
    b) when a vitamin A supplement that exceeds the RDA by five to ten times is used daily for several months
  13. Of the symptoms listed below, only___________is not cause by vitamin A toxicity

    a) headache

    b) dry, itchy skin

    c) bleeding nose

    d) inability to adapt to dim light
    d) inability to adapt to dim light
  14. The richest sources of vitamin A are

    a) fruits and vegetables

    b) dairy products

    c) liver and fish oils

    d) enriched breads and cereals
    c) liver and fish oils
  15. Of the foods listed below, only____________is not a rich source of beta-carotene

    a) canteloupe

    b) spinach

    c) beets

    d) pumpkin
    c) beets
  16. The precursor of vitamin D in the skin is called__________
    -7-dehydrocholesterol
  17. The most active of the following vitamin D metabolites is

    a) 25-OH D3

    b) 7-dehydrocholesterol

    c) 1,25-(OH)2 D3

    d) 24,25-(OH)2 D3
    c) 1,25-(OH)2 D3
  18. The final active form of vitamin D is formed by

    a) PTH in the bones

    b) hydroxylation in the kidneys

    c) irradiation of 7-dehydrocholesterol

    d) hydroxylation in the liver
    b) hydroxylation in the kidneys
  19. Vitamin D does not stimulate

    a) the intestine to absorb more calcium

    b) the bones to release calcium into the bloodstream

    c) the kidney to reabsorb more calcium

    d) the synthesis of 7-dehydrocholesterol
    d) the synthesis of 7-dehydrocholesterol
  20. Of the symptoms listed below,_____________would most likely be a result of vitamin D deficiency

    a) abnormally high serum calcium

    b) dry, itchy skin

    c) enlarged joints in children

    d) small hard bumps around hair follicles
    c) enlarged joints in children
  21. In children, the bone disease resulting from vitamin D deficiency is called__________; in adults, ____________
    • -rickets
    • -osteomalacia
  22. Of the groups listed below, only____________are not particularly susceptible to vitamin D deficiency

    a) low income, dark-skinned children

    b) infants who are exclusively breast-fed for long periods of time

    c) pregnant women

    d) elderly people who stay indoors
    -pregnant women
  23. Excessive vitamin D intakes by adults may result in

    a) deformities at the joints

    b) bowed legs

    c) retarded growth

    d) calcification of arteries
    d) calcification of arteries
  24. The Canadian Cancer Society recommends vitamin D intake be increased to 1000 IU

    a) to reduce risk of cardiovascular disease

    b) by adults over 50 years on a daily basis

    c) to reduce risk of diabetes

    d) to reduce the risk of colorectal, breast, and prostate cancers
    d) to reduce the risk of colorectal, breast, and prostate cancers
  25. The most reliable source of vitamin D in Canada

    a) the sun

    b) fortified milk

    c) meat

    d) vegetable oils
    b) fortified milk
  26. Vitamin E functions in the body as

    a) a free radical

    b) an antioxidant

    c) a coenzyme

    d) a hormone
    b) an antioxidant
  27. A free radical is

    a) a highly reactive molecule formed during the oxidation of saturated fatty acids

    b) formed when vitamin E is oxidized

    c) a highly reactive molecule formed during the oxidative of polyunsaturated fats

    d) a compound containing paired electrons
  28. c) a highly reactive molecule formed during the oxidative of polyunsaturated fats
  29. A deficiency of vitamin E in humans is most likely to cause

    a) hemolysis of red blood cells

    b) muscle weakness

    c) increased susceptibility to infections

    d) sterility
    a) hemolysis of red blood cells
  30. The symptoms of vitamin E deficiency in animals and humans can be attributed mainly to

    a) enzyme destuction

    b) disrupted cell membranes

    c) reduced energy metabolism

    d) accumulation of pigments in tissues
    b) disupted cell membranes
  31. Megadoses of vitamin E

    a) are considered benefical

    b) lower blood cholesterol levels

    c) alleviate acne

    d) rarely cause harm
    d) rarely cause harm
  32. Of the groups listed below, only____________would probably not benefit from a vitamin E supplement

    a) premature infants

    b) people who are highly exposed to air pollutants

    c) people with muscular dystrophy

    d) people with fat malabsorption diseases
    c) people with muscular dystrophy
  33. The need for vitamen E

    a) decrease with increasing polyunsaturated fat intake

    b) increases with increasing saturated fat intake

    c) increases with increasing polyunsaturated fat intake

    d) increases with increasing fat-soluble vitamin intake
    c) increases with increasing polyunsaturated fat intake
  34. Much of the vitamin E in the diet comes from

    a) vegetable oils, margarine, and salad dressings

    b) fruits and vegetables

    c) milk products

    d) liver
    vegetable oils, margarine, and salad dressings
  35. True/False (support your answer with an explanation)

    After being used for deep-frying, oil can turn rancid with relative ease, because the vitamin E has lost its activity as an antioxidant
    True
  36. Vitamin K deficiency produces

    a) hemolytic anemia

    b) convulsions

    c) jaundice

    d) hemorrhagic disease
    d) hemorrhagic disease
  37. Vitamin K deficiency is most likely to occur in

    a) premature infants

    b) full-term, breast-fed infants

    c) pregnant women

    d) people on fat-restricted diets
    a) premature infants
  38. Vitamin K is produced by micro-organisms in the

    a) pancreas

    b) GI tract

    c) stomach

    d) gallbladder
    b) GI tract
  39. True/False (support your answer with explanation)

    Under normal circumstances, intestinal synthesis of vitamin K by micro-organisms can provide all of the amount the body needs
    False

    The intestinal biosynthesis of vitamin K by micro-organisms can supply only half of the body's requirement
  40. The best dietary source of vitamin K is

    a) milk

    b) whole grain cereals

    c) green leafy vegetables

    d) fruit
    c) green leafy vegetables

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