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Questions and Answers

What is the caloric value of fat?

  • 9.3 kcal/g (correct)
  • 4.1 kcal/g
  • 6.8 kcal/g
  • 3.5 kcal/g
  • What proportion of calories in the average middle-class American diet come from fat?

  • 40%
  • 15%
  • 30%
  • 35% (correct)
  • Why do the protein needs of vegetarians who consume grade II proteins often require a large intake?

  • Grade II proteins result in high amino acid wastage (correct)
  • Grade II proteins digest slowly
  • Grade II proteins lack essential amino acids
  • Grade II proteins are expensive
  • What is the cheapest source of calories?

    <p>Carbohydrate</p> Signup and view all the answers

    Why is a diet low in saturated fats desirable?

    <p>To reduce the risk of heart disease</p> Signup and view all the answers

    What is the correlation between fat intake and standard of living internationally?

    <p>Positive correlation</p> Signup and view all the answers

    What is the percentage of calories provided by carbohydrates in most diets?

    <p>50% or more</p> Signup and view all the answers

    What is the daily protein intake recommended to supply essential acids and other amino acids?

    <p>1g/kg body weight</p> Signup and view all the answers

    In the setting of pancreatic insufficiency, which of the following is a significant mechanism for lipid digestion?

    <p>Gastric lipase</p> Signup and view all the answers

    What is the primary product of pancreatic lipase enzyme action?

    <p>2-monoglycerides</p> Signup and view all the answers

    What is the consequence of resecting more than 50% of the small intestine?

    <p>Malabsorption of nutrients and vitamins</p> Signup and view all the answers

    What is the primary mechanism of short-chain fatty acid absorption in the colon?

    <p>Specific transporters</p> Signup and view all the answers

    What is the significance of short-chain fatty acids in the colon?

    <p>They contribute to caloric intake and exert a trophic effect</p> Signup and view all the answers

    What is the main function of hephaestin (Hp) in iron absorption?

    <p>It facilitates basolateral transport of iron</p> Signup and view all the answers

    What is the effect of phytic acid on iron absorption?

    <p>It inhibits iron absorption</p> Signup and view all the answers

    What is the primary site of iron absorption in the body?

    <p>Duodenum</p> Signup and view all the answers

    What is the primary effect of increased leptin release on food intake?

    <p>It decreases food intake</p> Signup and view all the answers

    What is the effect of leptin resistance on food intake?

    <p>Food intake persists despite adequate adipose stores</p> Signup and view all the answers

    What is the primary function of ghrelin in the body?

    <p>To stimulate food intake</p> Signup and view all the answers

    Where is ghrelin primarily produced?

    <p>Stomach and other tissues such as pancreas and adrenal glands</p> Signup and view all the answers

    What is the effect of leptin on ghrelin secretion?

    <p>Leptin inhibits ghrelin secretion</p> Signup and view all the answers

    What is the effect of obesity on the ability of leptin to reduce ghrelin secretion?

    <p>The ability is lost</p> Signup and view all the answers

    What is the primary effect of ghrelin in the hypothalamus?

    <p>It increases the release of central orexins</p> Signup and view all the answers

    What is the possible explanation for the effectiveness of gastric bypass procedures for obesity?

    <p>Loss of activity of ghrelin</p> Signup and view all the answers

    What iron transport protein is responsible for binding Fe3+ in the plasma?

    <p>Transferrin</p> Signup and view all the answers

    Where is the HFE gene, associated with hereditary hemochromatosis, located?

    <p>Chromosome 6 short arm</p> Signup and view all the answers

    In acquired hemochromatosis, excess iron loads can be attributed to what factor?

    <p>Chronic destruction of red blood cells</p> Signup and view all the answers

    Which dietary constituent category do vitamins belong to?

    <p>Macronutrients</p> Signup and view all the answers

    Where is vitamin B12 predominantly absorbed?

    <p>Ileum</p> Signup and view all the answers

    In what part of the body is Leptin primarily produced?

    <p>Adipose tissue</p> Signup and view all the answers

    Which condition is associated with an increase in insulin resistance as weight increases?

    <p>Obesity</p> Signup and view all the answers

    What is the indicator used to assess body fat that involves weight and height measurements?

    <p>BMI</p> Signup and view all the answers

    Which enzyme is secreted in an inactive form by the stomach and is activated by gastric acid to hydrolyze the bonds between aromatic amino acids and a second amino acid?

    <p>Pepsin</p> Signup and view all the answers

    What is the primary dietary carbohydrate digested to any degree in the human GI tract by human enzymes?

    <p>Starches</p> Signup and view all the answers

    What molecule constitutes around 75% of dietary starch and is a branched molecule?

    <p>Amylopectin</p> Signup and view all the answers

    Which enzyme cleaves some peptide linkages in the stomach and is secreted in an inactive precursor form?

    <p>Pepsin</p> Signup and view all the answers

    Which amino acid transporter defect results in Hartnup disease?

    <p>Transport of neutral amino acids</p> Signup and view all the answers

    Which enzyme is important for the hydrolysis of peptide bonds by acting as an endopeptidase in the small intestine?

    <p>Trypsin</p> Signup and view all the answers

    Which product of lactose digestion causes symptoms like bloating, pain, gas, and diarrhea in lactose intolerant individuals?

    <p>Glucose</p> Signup and view all the answers

    What is the primary lipid-digesting enzyme secreted by the stomach?

    <p>Gastric lipase</p> Signup and view all the answers

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