Krause Food Nutrition Care Process 13th Edition Mahan – Test Bank

 

 

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Sample Test

Mahan: Krause’s Food and the Nutrition Care Process, 13th Edition

 

Test Bank

 

Chapter 3: The Nutrients and Their Metabolism

 

 

MULTIPLE CHOICE

 

1.    Which of the following hormones promotes a decrease in serum glucose levels?

a.	Epinephrine
b.	Glucagon
c.	Glucocorticoid
d.	Insulin

 

 

ANS:  D

Insulin is released in response to increases in blood glucose levels and promotes the cellular uptake of glucose. Glucagon is released when blood glucose levels decrease and is responsible for promoting glycogen breakdown and gluconeogenesis to increase blood glucose. Glucocorticoid works similarly, particularly in the stressed state. Epinephrine also promotes increases in blood glucose as an energy source in response to emotional state, as in the “fight-or-flight” situation.

 

REF:   p. 39

 

2.    Dietary fiber delays gastric emptying time and shortens intestinal transit time. What metabolic effect may result from this in a person with diabetes mellitus?

a.	Reduction in blood glucose level
b.	Increase in blood glucose level
c.	Decrease in ketone production
d.	Increase in glucose absorption

 

 

ANS:  A

Because of its effects on the gastrointestinal tract, interference with absorption of glucose by dietary fibers results in decreased uptake of glucose in the small intestine. This can be seen in decreased postprandial increases in blood glucose levels. As ketone production occurs during the fasted and starvation states of metabolism, no changes in ketone production would be seen after eating fiber.

 

REF:   p. 38

 

3.    What is the major end product of the digestion of dietary carbohydrate?

a.	Fructose
b.	Sucrose
c.	Mannose
d.	Glucose

 

 

ANS:  D

Glucose is the primary end product of starch digestion because starch is composed of chains of glucose. Although disaccharidases in the brush border result in the release of the monosaccharides fructose and galactose, the amount of these monosaccharides does not come close to that of glucose. Mannose is an undigestible hemicellulose.

 

REF:   p. 36

 

4.    What is the energy source for the central nervous system under normal conditions?

a.	Ketone bodies
b.	Glucose
c.	Fatty acids
d.	Amino acids

 

 

ANS:  B

Glucose is the obligate energy source for the brain and nervous system. As glucose and glycogen stores are depleted, amino acids are sacrificed for gluconeogenesis to maintain the nervous system. During starvation adaptation, ketones may be used as an energy source for the brain.

 

REF:   p. 33

 

5.    Which types of fiber function as prebiotics?

a.	Fructans
b.	Beta-glucans
c.	Lignins
d.	Pectins

 

 

ANS:  A

Fructans, such as fructo-oligosaccharide and inulin, promote the growth of beneficial bacterial species in the colon. Beta-glucans and pectins are soluble fibers that help reduce serum cholesterol. Lignin is a woody fiber that contributes to short-chain fatty acid production in the colon

 

REF:   p. 37

 

6.    If you were teaching a patient to reduce the saturated fat in his diet, which of the following would you instruct him to avoid?

a.	Olive and peanut oil
b.	Coconut and palm oil
c.	Safflower and corn oil
d.	Canola and cottonseed oil

 

 

ANS:  B

Coconut and palm oil are typical sources of short-chain fatty acids (SFAs) such as lauric and palmitic acids. Olive oil is a source of the monounsaturated fatty acid (MUFA) oleic acid. Peanut oil has the SFA arachidic acid. Safflower, corn, and cottonseed oils provide the polyunsaturated fatty acid (PUFA) linoleic acid, and canola oil provides the PUFA linolenic acid.

 

REF:   p. 43

 

7.    Which of the following is (are) the best source of omega-3 fatty acids?

a.	Fish oil
b.	Corn and safflower oil
c.	Coconut and palm oil
d.	Canola and peanut oil

 

 

ANS:  A

Fish and fish oils provide the highest concentrations of omega-3 fatty acids. Linolenic acid, which is an omega-3 fatty acid, is available from soybean, canola, and walnut oils.

 

REF:   pp. 41, 44

 

8.    What are the essential fatty acids?

a.	Linolenic acid and arachidonic acid
b.	Linoleic acid and arachidonic acid
c.	Linoleic acid and linolenic acid
d.	Eicosapentaenoic acid and phosphatidylcholine

 

 

ANS:  C

Because of the human body’s inability to synthesize omega-3 and omega-6 fatty acids, linoleic and linolenic acids have traditionally been identified as the essential fatty acids. The body can desaturate and elongate both of these fatty acids to produce, respectively, arachidonic acid and eicosapentaenoic acid. Suggestion has been made to apply the term “essential fatty acid” to longer chain fatty acids. Phosphatidylcholine is a phospholipid that is a major component of cell membranes.

 

REF:   pp. 41–42

 

9.    Which of these are primary sources of trans-fatty acids?

a.	Vegetable oils and butterfat
b.	Milk and eggs
c.	Flaxseed and canola oil
d.	Margarine and commercially fried foods

 

 

ANS:  D

Trans-fatty acids occur most frequently as a result of hydrogenation of unsaturated fats and oils. This forms a more solidified fat as in margarine or shortening. Commercial cooking with these types of fats contributes to increased intake. Some trans-fatty acids occur more naturally in foods, such as in butter and animal fat, but this is because of bacterial fermentation. Oils do not contain trans-fatty acids.

 

REF:   pp. 44–45

 

10.  Which fall into the category of isoprenoids?

a.	Glucocorticoid and mineralocorticoid
b.	Lycopene and carotenoid
c.	Cerebrosides and gangliosides
d.	Bile acid

 

 

ANS:  B

Isoprenoids are lipids that contain alternating single and double bonds, allowing for electron transfer, thus providing antioxidant activity. Plant pigments, such as lycopene and the carotenoids, allow for electron transfer during photosynthesis. Glucocorticoids, mineralocorticoids, and bile acids are steroid derivatives of cholesterol. Cerebrosides and gangliosides are structural components of nerve tissue and examples of glycolipids.

 

REF:   p. 46

 

11.  How do protein-based fat replacers function in commercial food products?

a.	They act as bulking agents.
b.	They promote gelatinization and water retention.
c.	They provide mouth texture.
d.	They act as thickening agents.

 

 

ANS:  C

Protein-based fat replacers tend to provide a fatlike mouth feel to food products. Various carbohydrate-based fat replacers serve other functions, such thickening, gelatinization, and bulking properties in foods.

 

REF:   p. 47

 

12.  Which of these groups contains only essential amino acids?

a.	Arginine, tryptophan, threonine, serine
b.	Glycine, histidine, isoleucine, leucine
c.	Valine, glutamine, asparagine, alanine
d.	Phenylalanine, threonine, histidine, leucine

 

 

ANS:  D

Essential amino acids are ones that have carbon skeletons that humans are incapable of synthesizing. These include valine, leucine, isoleucine, methionine, threonine, phenylalanine, tryptophan, lysine, and in the case of infants, cysteine and histidine.

 

REF:   p. 51

 

13.  What is the name of the process in which the amine group of an amino acid is removed before oxidation for energy?

a.	Transamination
b.	Beta-oxidation
c.	Deamination
d.	Reverse amination

 

 

ANS:  C

Deamination is a necessary step in the use of an amino acid for energy production or gluconeogenesis. Transamination involves the transfer of an amino group from one amino acid to another. Beta-oxidation refers to the catabolism of fatty acids to yield energy. When the amino group is removed, it is routed to the urea cycle. This eliminates the nitrogen component and prevents a reverse in the process.

 

REF:   p. 51

 

14.  Which step in protein synthesis occurs at the ribosome?

a.	Peptide bonding of amino acids
b.	Ribosomal RNA production
c.	Messenger RNA production
d.	Transfer RNA production

 

 

ANS:  A

The assembly of the peptide chain occurs at the ribosome as protein translation occurs. The production of mRNA, tRNA, and rRNA all occur in the nucleus of the cell as steps in transcription.

 

REF:   pp. 51

 

15.  Which of the following improves protein quality?

a.	Wine or vinegar marinade
b.	Increasing soybean intake
c.	The Maillard reaction
d.	Exposing meat to sulfur dioxide

 

 

ANS:  A

Marinade promotes denaturation of meat proteins, which improves digestibility and thus protein quality. Soybeans contain a trypsinase that inhibits trypsin activity. Browning that occurs through the Maillard reaction can cause a loss of lysine. Exposing meat to sulfur dioxide or oxidation processes can cause a loss of methionine.

 

REF:   p. 52

 

16.  Which of the following characteristics are seen in an adult experiencing marasmus?

a.	Muscular wasting and absence of subcutaneous fat
b.	Pitting edema
c.	Hypoalbuminemia and presence of pitting edema
d.	Enlarged fatty liver and hyperalbuminemia

 

 

ANS:  A

Marasmus, or adapted starvation, results in a person losing both muscle and fat mass. This is as opposed to kwashiorkor, technically childhood condition of protein-calorie malnutrition, in which lack of protein intake results in a loss of albumin and the presence of edema. Fatty liver results from buildup of triglycerides in hepatic tissue; however, in the case of starvation, fatty acids are converted into ketones as opposed to being re-esterified into triglycerides. Additionally, albumin synthesis is impaired.

 

REF:   p. 55

 

17.  Which of the following removes chylomicrons from the blood a few hours after eating?

a.	Low-density lipoproteins
b.	Lipoprotein lipase
c.	Carnitine
d.	Adrenocorticotropic hormone

 

 

ANS:  B

Lipoprotein lipase is an enzyme that binds the chylomicrons so that triglycerides may be cleaved to release fatty acids into adipocytes. Chylomicron remnants are taken up by the liver and resynthesized into very low-density lipoprotein (VLDL). After VLDL has more triglyceride removed by lipoprotein lipase, it becomes low-density lipoprotein. Carnitine is a co-factor in the transport of fatty acids into the mitochondria of cells.

 

REF:   p. 54

 

18.  What disease results from a deficiency of niacin?

a.	Scurvy
b.	Beriberi
c.	Pellagra
d.	Rickets

 

 

ANS:  C

In 1918, Joseph Goldberger demonstrated that a high-quality protein diet could cure pellagra. Time passed before research determined that the amino acid tryptophan was a precursor for the vitamin niacin. Scurvy results from deficiency of vitamin C, beriberi from thiamin deficiency, and rickets from vitamin D deficiency.

 

REF:   p. 56

 

19.  What types of foods are bioflavonoids found in?

a.	Fruits and vegetables
b.	Vegetables only
c.	Fruits only
d.	Meats, fruits, and vegetables

 

 

ANS:  A

Bioflavonoids have antioxidant properties that help reduce capillary fragility and promote the activity of vitamin C. They are widely available in all foods of plant origin.

 

REF:   p. 91

 

20.  In the treatment of what condition has supplemental CoQ₁₀ been demonstrated to be effective?

a.	Lung cancer
b.	Colon cancer
c.	Congestive heart failure
d.	Pellagra

 

 

ANS:  C

Coenzyme Q₁₀ is a ubiquinone, which has reduction-oxidation properties that allow it to function as an antioxidant. Supplementation of CoQ₁₀ has been shown to be useful in the treatment of cardiomyopathy and congestive heart failure. Food sources of CoQ₁₀ include fish and fish oils, nuts, and meat.

 

REF:   p. 91

 

21.  As many as 40% of Americans may be deficient in which of the following vitamin?

a.	Vitamin A
b.	Vitamin E
c.	Ascorbic acid
d.	Vitamin D

 

 

ANS:  D

Vitamin D has been the focus of intense research. More than 50 genes are known to be regulated by vitamin D. The normal adult is presumed to obtain sufficient vitamin D from exposure to sunlight and incidental ingestion through small amounts in foods. However, increasing evidence suggests that vitamin D status is low, especially in people with dark skin, in those who spend little time outside, and in those who live in the northern areas of the country.

 

REF:   62

 

22.  Which vitamin functions with the coenzymes NAD and NADP?

a.	Niacin
b.	Riboflavin
c.	Ascorbic acid
d.	Pyridoxine

 

 

ANS:  A

Nicotinamide adenine dinucleotide contains niacin, another word for nicotinamide. Riboflavin is in the coenzymes flavin adenine mononucleotide (FMN) and flavin adenine dinucleotide (FAD). Pyridoxine is in the coenzyme pyridoxal phosphate. Ascorbic acid, or vitamin C, does not function as a coenzyme.

 

REF:   p. 58

 

23.  How is vitamin D deficiency manifested in adults?

a.	Hypocalcemia
b.	Osteoporosis
c.	Osteomalacia
d.	Hypophosphatemia

 

 

ANS:  C

Osteomalacia is the adult equivalent of rickets. Osteoporosis is associated with aging. Bone density is used as a diagnostic measure of these conditions. Low levels of blood calcium and phosphorus can result from conditions other than vitamin D deficiency.

 

REF:   p. 69

 

24.  The continued use of antibiotic therapy can reduce bacterial flora in the gut. Which of the following may result from this?

a.	Deficiency in vitamin K
b.	Deficiency in vitamin C
c.	Toxicity of vitamin A
d.	Toxicity of biotin

 

 

ANS:  A

Although vitamin K deficiency is rare, it can occur in long-term antibiotic therapy as intestinal flora produce menaquinones absorbable by humans. Cigarette smoking has been associated with decreased vitamin C serum levels. Vitamin A toxicity is promoted by continuing to take in large doses through supplements. Biotin has not been demonstrated to have toxic effects.

 

REF:   p. 74

 

25.  To prevent hemorrhagic disease in newborns, which vitamin is administered to infants shortly after birth?

a.	Vitamin C
b.	Thiamin
c.	Vitamin D
d.	Vitamin K

 

 

ANS:  D

Because breast milk is a poor source of vitamin K and the newborn gastrointestinal tract is sterile and has not developed bacterial species, menadione injection is given at birth. Vitamin D supplementation of infants is recommended for breastfed infants and infants fed less than 500 mL of vitamin D fortified formula who do not receive adequate sun exposure. Water-soluble vitamin content of breast milk reflects the intake of the mother. Commercial infant formula must provide nutrients at levels established by law.

 

REF:   p. 74

 

26.  Which vitamin is involved with normal bone development, epithelial cell formation, and visual pigment formation?

a.	Pyridoxine
b.	Vitamin D
c.	Vitamin A
d.	Ascorbic acid

 

 

ANS:  C

The various forms of vitamin A are involved in vision, gene expression, cellular differentiation, bone development, reproduction, and immune function. Pyridoxine functions in amino acid metabolism and in the synthesis of neurotransmitters. Vitamin D is involved in gene transcription and in calcium and phosphorus homeostasis. Ascorbic acid works in antioxidant activity and is involved in the synthesis of collagen.

 

REF:   p. 60

 

27.  Which of these vitamins is destroyed by ultraviolet irradiation?

a.	Riboflavin
b.	Vitamin D
c.	Pyridoxine
d.	Niacin

 

 

ANS:  A

Riboflavin is destroyed by ultraviolet light, which is one of the reasons that milk was packaged in cartons. Vitamin D is produced by skin exposure to ultraviolet irradiation. Pyridoxine and niacin are stable in light.

 

REF:   p. 77

 

28.  The absorption of ingested vitamin D occurs along with the absorption of what?

a.	Protein and lactose
b.	Lipids
c.	Carbohydrates and niacin
d.	Thiamin and glucose

 

 

ANS:  B

Vitamin D is a fat-soluble vitamin and must be transported with dietary lipids. The best dietary sources of vitamin D are fish liver oils. Variable amounts are in butter, cream, and egg yolk. Milk is commonly fortified to provide a dietary source of vitamin D.

 

REF:   p. 62

 

29.  Which set of vitamins is involved in cellular energy production?

a.	Ascorbic acid, thiamin, riboflavin, and carnitine
b.	Niacin, ascorbic acid, pantothenic acid, and thiamin
c.	Pyridoxine, vitamin A, thiamin, and riboflavin
d.	Thiamin, niacin, riboflavin, and pantothenic acid

 

 

ANS:  D

Thiamin serves as a coenzyme in relation to glucose, pyruvate, and alpha-keto acid metabolism. Riboflavin serves as a coenzyme in fatty acid oxidation and glucose metabolism. Niacin is important in beta-oxidation, the TCA cycle, and the electron transport system. Pantothenic acid is a part of coenzyme A, which plays a central role in the metabolism of glucose, amino acids, and fatty acids.

 

REF:   p. 74

 

30.  Which vitamin is needed for transaminases to function during protein metabolism?

a.	Thiamin
b.	Pyridoxine
c.	Riboflavin
d.	Niacin

 

 

ANS:  B

The aldehyde group of pyridoxal phosphate reacts with the a-amino group of an amino acid to stabilize it, allowing for other enzymes to affect the amino acid. Thiamin, riboflavin, and niacin affect protein metabolism through metabolism of the keto body portion of the amino acid.

 

REF:   p. 81

 

31.  Which best describes the functions of vitamin C?

a.	Enhancing iron absorption and collagen formation
b.	Essential for calcium and phosphate absorption
c.	Biosynthesis of sphingolipids in the myelination of nerve cells
d.	Promotes synthesis and repair of DNA

 

 

ANS:  A

Vitamin C improves iron absorption through reduction of iron to its ferrous form and chelation for absorption. Additionally, vitamin C is involved in collagen synthesis. Vitamin D is necessary for calcium and phosphorus absorption. Pyridoxine promotes biosynthesis of sphingolipids for myelination. Folate functions in single-carbon transfer reactions such as those involved in the metabolism of nucleotides in DNA synthesis.

 

REF:   pp. 58, 88

 

32.  What condition is evidenced by symptoms of mental confusion, muscular wasting, edema, and peripheral neuropathy?

a.	Niacin deficiency
b.	Vitamin C deficiency
c.	Hypervitaminosis A
d.	Thiamin deficiency

 

 

ANS:  D

Beriberi, the thiamin deficiency disease, includes symptoms of mental confusion, muscular wasting, edema, peripheral neuropathy, tachycardia, and cardiomegaly. Niacin deficiency, pellagra, is evidenced by dermatitis, dementia, and diarrhea. Vitamin C deficiency, or scurvy, presents with swollen and bleeding gums, lethargy, bone weakness, muscle atrophy, and skin lesions. Hypervitaminosis A includes dry lips, nasal passages, and eyes; skin dryness; hair loss; and nail fragility.

 

REF:   p. 76

 

33.  Which form of vitamin A is a structural component of the visual pigments of the rods and cells in the retina?

a.	Beta carotene
b.	Retinal
c.	Retinoic acid
d.	Retinol

 

 

ANS:  B

Retinal in the rods and cells of the retina contributes to the photosensitivity associated with sight. Beta carotene is a precursor of the active forms of vitamin A. Retinoic acid is the form of vitamin A involved in cellular expression. Retinol is the transport and storage form of vitamin A.

 

REF:   p. 58

 

34.  In vitamin D metabolism, which version of vitamin D is produced by the liver and then transported to the kidney?

a.	7-Dehydrocholesterol
b.	Cholecalciferol
c.	25-Hydroxycholecalciferol
d.	Calcitriol

 

 

ANS:  C

7-Dehydrocholesterol is one of the vitamin D precursors in the skin that undergoes transformation to cholecalciferol when the skin is exposed to ultraviolet light. Cholecalciferol travels to the liver, where it undergoes its first hydroxylation, yielding 25-hydroxycholecalciferol. This form, the version most common in blood circulation, travels to the kidney for the second hydroxylation, producing the final active form, calcitriol.

 

REF:   p. 62