Nutrition 6

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bobbie2013
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Nutrition 6
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2010-08-03 18:03:41
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NUTR 330
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  1. Proteins differ from carbohydrates and lipids in that they contain

    a) carbon

    b) hydrogen

    c) oxygen

    d) nitrogen
    d) nitrogen
  2. Of the chemical groups listed below, only a/an________group is not part of all amino acids

    a) carboxylic acid

    b) hydrogen

    c) methyl

    d) amino
    c) methyl
  3. A peptide bond is formed when two amino acids are combined by linking one

    a) amino group to the amino group of another amino acid

    b) amino group to the acid group of another amino acid

    c) amino group to the hydrogen group of another amino acid

    d) acid group to the acid group of another amino acid
    b) amino group to the acid group of another amino acid
  4. Compared to a protein in its original state, a protein which has been denatured

    a) is more difficult to digest

    b) has fewer calories

    c) had inferior nutritional quality

    d) has lost its biological activity
    d) has lost its biological activity
  5. Protein digestion occurs primarily in

    a) the mouth

    b) the stomach

    c) the small intestine

    d) the large intestine
    c) the small intestine
  6. Pepsin is

    a) a small peptide formed during protein digestion

    b) a proenzyme secreted into the duodenum

    c) a gastric enzyme which breaks large polypeptides into smaller polypeptides

    d) an intestinal enzyme which breaks polypeptides into amino acids
    c) a gastric enzyme which breaks large polypeptides into smaller polypeptides
  7. Protein digestion in the stomach produces

    a) a mixture of amino acids, dipeptides, and tripeptides

    b) free amino acids only

    c) small polypeptides

    d) large polypeptides
    c) small polypeptides
  8. Pepsinogen is converted to pepsin by

    a) trypsin

    b) enteropeptidase

    c) chymotrypsin

    d) hydrocholoric acid
    d) hydrocholoric acid
  9. A non-essential amino acid

    a) must be supplied in the diet

    b) can be made from lipids

    c) can be produced endogenously if nitrogen and carbohydrate are present
    c) can be produced endogenously if nitrogen and carbohydrate are present
  10. A human adult requires__________essential amino acids

    a) 20

    b) 12

    c) 9

    d) 5
    c) 9
  11. A limiting amino acid is

    a) any amino acid that cannot be synthesized in the body

    b) an amino acid that can be synthesized only in limited amounts

    c) the essential amino acid found in shortest supply relative to the amount needed for protein synthesis

    d) an amino acid that limits the absorption of other essential amino acids by competing with them for carriers on the intestinal membrane
    c) the essential amino acid found in shortest supply relative to the amount needed for protein synthesis
  12. Of the factors listed below, only____________does not affect the quality of dietary protein

    a) the presence of all amino acids

    b) the digestibility of the proteins

    c) the balance of EAA

    d) the adequacy of all EAA
    a) the presence of all amino acids
  13. True/False (support your answer with an explanation)

    Incomplete proteins will not be absorbed because of the lack of one or more EAA
    False

    The absorption of amino acids from the GI tract does not require the presence of all EAA. It is in support of protein synthesis that all EAA must be available simultaneously in the body
  14. ___________would complement the protein in dried beans

    a) brown rice

    b) brown bread

    c) milk

    d) sunflower seeds

    e) any of the above
    e) any of the above
  15. Of the functions listed below, only____________is not amoung the general roles of protein

    a) storing energy

    b) building body tissues

    c) maintaining body tissues

    d) regulating body functions
    a) storing energy
  16. Proteins are important regulators of acid-base balance because

    a) they are large molecules; therefore they cannot diffuse through membranes

    b) they stay trapped inside the cell where acid-base balance must be maintained

    c) they can function as both acids and bases

    d) a and b
    c) they can function as both acids and bases
  17. Contractile proteins function in

    a) blood glucose regulation

    b) iron transport

    c) muscle function

    d) vision

    e) oxygen transport
    c) muscle function
  18. Hemoglobin functions in

    a) blood glucose regulation

    b) iron transport

    c) muscle function

    d) vision

    e) oxygen transport
    e) oxygen transport
  19. Transferrin functions in

    a) blood glucose regulation

    b) iron transport

    c) muscle function

    d) vision

    e) oxygen transport
    b) iron transport
  20. Insulin functions in

    a) blood glucose regulation

    b) iron transport

    c) muscle function

    d) vision

    e) oxygen transport
    a) blood glucose regulation
  21. Opsin functions in

    a) blood glucose regulation

    b) iron transport

    c) muscle function

    d) vision

    e) oxygen transport
    d) vision
  22. If nitrogen balance is negative,

    a) nitrogen intake exceeds nitrogen output

    b) nitrogen output exceeds nitrogen intake

    c) the body is growing

    d) too much protein is being consumed
    b) nitrogen output exceeds nitrogen intake
  23. If nitrogen intake is equal to nitrogen output, the subject is

    a) in positive nitrogen balance

    b) consuming inadequate amounts of protein

    c) probably losing weight

    d) consuming enough protein to replace body losses
    d) consuming enough protein to replace body losses
  24. True/False (support your answer with an explanation)

    Negative nitrogen balance occurs in children and pregnant women because they require extra protein
    False

    Positive nitrogen balance occurs in this situation
  25. Protein deficiency is most commonly seen in Third World countries

    a) adults

    b) pregnant women

    c) elderly people

    d) children
    d) children
  26. List some of the body systems that are affected in a child when protein intake is insufficient
    When a child's protein intake is insufficient, the body systems affected include the muscles (including the heart), the brain, the metabolic system, the system regulating growth, the system regulating fluid balance, the liver, the skin and hair, the immune system, and the blood
  27. Why does PEM most commonly strike newly weaned children?
    PEM is most common amoung newly weaned children because their bodies must adjust to a starchy, low-protein diet after having been accustomed to a diet of protein-rich breast milk
  28. True/False (support your answer with an explanation)

    As athletes or muscle-builders have higher protein needs than ordinary foods can supply, protein supplements are necessary
    False

    Although athletes may have a higher protein need than non-athletes, they can easily obtain enough protein through the increased food intake usually consumed for extra energy. Exercise, not protein supplements, stimulates muscle-building
  29. Nutritional concerns are greatest in the diet of

    a) lacto-ovo vegetarians

    b) strict non-meat eaters

    c) lactovegetarians

    d) vegans
    d) vegans
  30. A vegan diet will potentially have the greatest negative impact on the nutritional status of

    a) growing children

    b) adults on weight reduction diets

    c) underweight adults

    d) senior adults
    a) growing children
  31. What micronutrients can potentially be a problem for vegetarians?
    • -Iron
    • -zinc
    • -calcium
    • -vitamin B-12
    • -vitamin D
  32. The health benefits of a vegetarian diet include a reduced risk of all of the ailments listed below, except

    a) migraine

    b) coronary artery disease

    c) colon cancer

    d) obesity
    a) migraine
  33. The ideal level of protein intake is____________of total energy intake for most adults

    a) 5-10%

    b)10-12%

    c) 15-20%

    d) 30% or less
    b) 10-12%
  34. In Canada, protein intake is about_____________of energy intake

    a) 8%

    b) 11%

    c) 16%

    d) 20%
    c) 16%
  35. The only segment of the Canadian population that may be at risk for dietary protein inadequacy is

    a) infants

    b) growing children

    c) adult men

    d) female seniors
    d) female seniors

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