Deck 5: The Lipids: Triglycerides, Phospholipids, and Sterols

Question 1

What type of compound is lecithin?

A)Bile salt
B)Glycolipid
C)Lipoprotein
D)Phospholipid
E)Sterol

Answer 1

D

Question 2

Lipids that are liquid at room temperature are known as ____.

A)oils
B)fats
C)omegas
D)glycerols
E)phospholipids

Answer 2

A

Question 3

Which statement describes is a feature of choline?

A)It is a part of lecithin.
B)It is a type of cis-fatty acid.
C)It is a type of trans-fatty acid.
D)It is attached to omega-3 fatty acids.
E)It has a multiple ring structure.

Answer 3

A

Question 4

Which food contains cholesterol?

A)Corn
B)Olives
C)Roasted turkey
D)Roasted peanuts
E)Boiled potatoes

Question 5

Which product has the highest percentage of its fat in polyunsaturated form?

A)Butter
B)Corn oil
C)Beef tallow
D)Coconut oil
E)Palm oil

Question 6

Which compound is missing four or more hydrogen atoms?

A)Monounsaturated fatty acid
B)Polyunsaturated fatty acid
C)Long-chain saturated fatty acid
D)Short-chain saturated fatty acid
E)Triglycerides

Question 7

Lipids that are solid at room temperature are known as ____.

A)oils
B)fats
C)omegas
D)glycerols
E)phospholipids

Question 8

What product has the highest percentage of its fat in saturated form?

A)Butter
B)Walnut oil
C)Beef tallow
D)Coconut oil
E)Chicken fat

Question 9

What is the chemical composition of fats?

A)Hexose polymers
B)Glycogen granules
C)Fatty acids and glycerol
D)Combinations of long-chain fatty acids
E)Esters of carbon and hydrogen

Question 10

Which product provides abundant amounts of omega-3 fatty acids?

A)Palm oil
B)Walnut oil
C)Soybean oil
D)Flaxseed oil
E)Corn oil

Question 11

What is the major source of "good" cholesterol?

A)Fatty fish
B)Fatty meat
C)Endogenous synthesis
D)Monounsaturated and polyunsaturated fatty acids
E)Dairy foods

Question 12

Which item is a chief source of short-chain and medium-chain fatty acids?

A)Fish
B)Eggs
C)Dairy
D)Soybeans
E)Fruit

Question 13

Lipids differ in their degree of saturation or unsaturation due to their number of ____.

A)amino acids
B)double bonds
C)saccharide units
D)peptide linkages
E)oxygen atoms

Question 14

In which form are most dietary lipids found?

A)Sterols
B)Glycerols
C)Triglycerides
D)Monoglycerides
E)Polyglycerides

Question 15

What is a conjugated linoleic acid?

A)A type of cis-fatty acid
B)A partially hydrogenated omega-6 lipid
C)A fatty acid with the chemical make-up of linoleic acid but with a different configuration
D)A fatty acid resulting from the partial hydrolysis of dietary phospholipids in the intestinal tract
E)A nitrogen-containing compound found in foods and made in the body from the amino acid methionine.

Question 16

The easiest way to increase intake of oleic acid is to consume more ____.

A)lard oil
B)corn oil
C)olive oil
D)safflower oil
E)tallow oil

Question 17

Which statement describes a feature of trans-fatty acids?

A)In nature, most double bonds are trans.
B)Hydrogenation converts trans-fatty acids to cis-fatty acids.
C)The conversion of cis-fatty acids to trans-fatty acids is inhibited by the presence of antioxidants.
D)In the body, trans-fatty acids are metabolized more like saturated fats than like unsaturated fats.
E)The hydrogen atoms are located on the same side of a double bond.

Question 18

What is a common dietary saturated fatty acid?

A)Oleic acid
B)Stearic acid
C)Linolenic acid
D)Arachidonic acid
E)Lineolic acid

Question 19

Which product is considered a major source of polyunsaturated fat?

A)Corn oil
B)Palm oil
C)Peanut oil
D)Chicken fat
E)Olive oil

Question 20

About how much cholesterol is synthesized by the liver every day?

A)100 to 300 mg
B)300 to 500 mg
C)500 to 800 mg
D)800 to 1500 mg
E)1500 to 2500 mg

Question 21

Which example characterizes enterohepatic circulation?

A)Chylomicron conversion to LDLs and HDLs
B)Recycling of bile from the intestine to the liver
C)Hormonal control of pancreatic digestive secretions
D)Liver secretion of eicosanoids that promote absorption of eicosanoid precursors
E)Cholesterol that is made from bile in the small intestine and transported to the liver

Question 22

Which of the following is a characteristic of cholesterol?

A)It is absorbed directly into the blood
B)It is a precursor for bile and vitamin D synthesis
C)It is not formed in the body when provided by the diet
D)It is found in abundance in tropical fats such as palm oil
E)It has no functions in the healthy body.

Question 23

What is the immediate precursor for the eicosanoids?

A)Glucose
B)Hormones
C)Fatty acids
D)Cholesterol
E)Lipases

Question 24

In comparison to a low-density lipoprotein, a high-density lipoprotein contains ____.

A)less lipid
B)less protein
C)more cholesterol
D)more carbohydrate
E)more triglyceride

Question 25

A high risk of heart attack correlates with high blood levels of ____.

A)free fatty acids
B)high-density lipoproteins
C)low-density lipoproteins
D)very low-density lipoproteins
E)omega-3 fatty acids

Question 26

An important function of fat in the body is to ____.

A)build muscle tissue
B)regulate blood glucose levels
C)protect vital organs against shock
D)provide precursors for glucose synthesis
E)facilitate reproduction

Question 27

Chylomicrons are synthesized within the ____.

A)liver
B)intestinal cells
C)lymphatic system
D)storage compartment of plant seeds
E)spleen

Question 28

What part of the gastrointestinal tract is the predominant site of dietary fat hydrolysis?

A)Mouth
B)Stomach
C)Small intestine
D)Large intestine
E)Esophagus

Question 29

Which acid is an omega-3 fat?

A)Acetic acid
B)Palmitic acid
C)Linoleic acid
D)Docosahexaenoic acid
E)Arachidonic acid

Question 30

Which lipid is an essential nutrient?

A)Lecithin
B)Cholesterol
C)Stearic acid
D)Linoleic acid
E)Adipokine

Question 31

In the digestion of fats, emulsifiers function as ____.

A)enzymes
B)hormones
C)detergents
D)chylomicrons
E)macrophages

Question 32

Which lipoprotein contains the highest percentage of cholesterol?

A)Chylomicron
B)Low-density lipoprotein
C)High-density lipoprotein
D)Very-low-density lipoprotein
E)Very-high density lipoprotein

Question 33

After a fat-containing meal is absorbed, about how many hours does it take the body to remove the chylomicrons from the blood?

A)2
B)5
C)10
D)14
E)16

Question 34

What tissue contains special receptors for removing low-density lipoproteins from the circulation?

A)Liver
B)Adipose
C)Arterial walls
D)Skeletal muscle
E)Smooth muscle

Question 35

Which statement characterizes the lipase enzymes?

A)Gastric lipase plays a significant role in fat digestion in adults
B)Intestinal mucosal lipase is responsible for most dietary fat digestion
C)Salivary gland lipase (lingual lipase) plays an active role in fat digestion in infants
D)Pancreatic lipase hydrolyzes most dietary triglycerides completely to glycerol and free fatty acids
E)Pancreatic lipase forms emulsified fats from monoglycerides

Question 36

Spherical complexes of emulsified fats are known as ____.

A)micelles
B)chylomicrons
C)monolipomicrons
D)endogenous bilayer aggregates
E)polymerized lipids

Question 37

What are the substances resistin and adiponectin?

A)Glycolipids that regulate synthesis of lipoproteins
B)Intestinal cell hormones that regulate secretion of bile
C)Intestinal cell hormones that trigger secretion of pancreatic juice
D)Proteins secreted from fat cells that help regulate energy balance
E)Substances that dampen inflammation and decrease insulin resistance

Question 38

What term may be used to describe a hydrophobic substance?

A)Lipophilic
B)Lipophobic
C)Glycerophilic
D)Glycerophobic
E)Emulsifiable

Question 39

Bile is known to assist in the absorption of ____.

A)fat
B)carbohydrate
C)protein
D)vitamins
E)minerals

Question 40

How is soluble fiber in the diet thought to help lower blood cholesterol level?

A)It denatures cholesterol in the stomach.
B)It hydrolyzes cholesterol in the intestinal tract.
C)It traps cholesterol in the intestinal tract and thus inhibits its absorption.
D)It enhances excretion of bile leading to increased cholesterol turnover.
E)It binds to the fats and denatures them.

Question 41

What are the precursors for synthesis of the eicosanoids?

A)Steroids
B)Short-chain fatty acids
C)Medium-chain saturated fatty acids
D)Long-chain polyunsaturated fatty acids
E)Monounsaturated fatty acids

Question 42

Which statement best describes the nutritional value of eggs?

A)Eggs are high in both cholesterol and saturated fat.
B)High omega-3 fat eggs are now available by prescription only.
C)Although it is high in cholesterol, the egg is low in saturated fat.
D)Even in people with a healthy lipid profile, consumption of one egg/day is detrimental.
E)Egg substitutes often have higher levels of cholesterol than do eggs.

Question 43

Which statement is true of the relationship fat intake and health?

A)Intake of saturated fat raises blood cholesterol more than intake of cholesterol
B)High intakes of fish oil lower bleeding time and improve diabetes and wound healing
C)High intakes of short- and medium-chain fatty acids raise high-density lipoprotein levels
D)Trans-fatty acids contained in polyunsaturated fats but not in monounsaturated fats alter blood cholesterol levels
E)Trans-fatty acids are not as dangerous as once believed

Question 44

How much energy does one gram of fat provide?

A)3 kcal
B)5 kcal
C)7 kcal
D)9 kcal
E)11 kcal

Question 45

According to the Dietary Guidelines, what should be the maximum total fat intake as a percentage of energy intake?

A)10
B)20
C)35
D)50
E)60

Question 46

The oils found in walnuts, soybeans, flaxseed, and wheat germ represent a good source of preformed ____.

A)eicosanoids
B)linolenic acid
C)docosahexaenoic acid
D)eicosapentaenoic acid
E)linoleic acid

Question 47

When consumed regularly, which fatty acid helps prevent the formation of blood clots?

A)Oleic acid
B)Stearic acid
C)Arachidonic acid
D)Eicosapentaenoic acid
E)Linoleic acid

Question 48

Which source of lipids should be substituted for saturated fats to help lower blood cholesterol levels?

A)Butter
B)Canola oil
C)Coconut oil
D)Stick margarine
E)Shortening

Question 49

Which statement describes a recognized relationship between dietary fat and cancer?

A)Fat from milk does not increase risk for cancer.
B)Dietary fat initiates rather than promotes cancer formation.
C)High intakes of omega-3 fatty acids promote cancer development in animals.
D)The evidence linking fat intake with cancer is stronger than that linking it with heart disease.
E)There is a strong link between breast cancer incidence and dietary fat.

Question 50

A lacto-ovo vegetarian wishing to ensure a liberal intake of linolenic acid should consume ____.

A)eggs and milk
B)canola oil and walnuts
C)safflower oil margarine
D)corn oil and sunflower oil

Question 51

The results of blood tests that reveal a person's total cholesterol and triglycerides are called a ____.

A)lipid profile
B)circulating fat count
C)personal lipids count
D)degenerative disease assessment
E)lipid balance ratio

Question 52

What is the approximate average daily trans-fatty acid intake in the United States?

A)500 mg
B)2 g
C)5 g
D)12 g
E)18 g

Question 53

Aspirin works to reduce the symptoms of infection or pain by retarding the synthesis of

A)arachidonic acid.
B)certain eicosanoids.
C)certain saturated fatty acids.
D)certain unsaturated fatty acids.
E)certain adipokines

Question 54

What is the function of lipoprotein lipase?

A)Synthesizes lipoproteins in liver cells
B)Synthesizes triglycerides in adipose cells
C)Assembles lipid particles into chylomicrons
D)Hydrolyzes blood triglycerides for uptake into cells
E)Stimulates the release of triglycerides from the liver

Question 55

Which product is a good source of eicosapentaenoic acid?

A)Tuna
B)Butter
C)Salad oil
D)Shortening
E)Corn oil

Question 56

A person who regularly consumes fish such as shark, king mackerel, and swordfish is at risk for ingesting potentially toxic amounts of ____.

A)EPA
B)DHA
C)mercury
D)cadmium
E)dioxins

Question 57

What is the function of adipose cell hormone-sensitive lipase?

A)Hydrolyzes hormones involved in fat breakdown
B)Synthesizes new adipose cells from simple fatty acids
C)Hydrolyzes triglycerides to provide fatty acids for other cells
D)Synthesizes long-chain fatty acids to provide precursors for other cells
E)Regulation of blood pressure and blood clotting

Question 58

Approximately how much saturated fat is in a plain baked potato?

A)0 g
B)1 g
C)2 g
D)3 g
E)4 g

Question 59

Approximately what percentage of the body's energy needs at rest is supplied by fat?

A)5
B)25
C)40
D)60
E)75

Question 60

Approximately how much saturated fat is in 8 ounces of whole milk?

A)2 g
B)5 g
C)8 g
D)12 g
E)15 g

Question 61

Of the total fat content of the most commonly eaten nuts in the United States, what is the approximate percentage of monounsaturated fat?

A)29
B)39
C)49
D)59
E)69

Question 62

What dietary advice is appropriate for reducing fat intake?

A)Limit intake of all fried foods because they contain abundant fat.
B)Substitute crackers and cornbread for other starches because they are likely lower in fat.
C)Consume foods with more invisible fat because this type of fat is not absorbed well from the digestive tract.
D)Increase consumption of soups, such as cream-of-mushroom soup prepared with water, because the fat content is usually very low.
E)Increase dairy consumption while decreasing consumption of fats from other sources, because dairy fats do not contribute to disease.

Question 63

All ____________________ have the same basic structure-a chain of carbon and hydrogen atoms with an acid group (COOH) at one end and a methyl group (CH3) at the other end.

Question 64

Cholesterol from outside the body is called ____________________ cholesterol.

Question 65

Surveys show that U.S. adults' average intake of fat as a percentage of total energy intake is ____.

A)14%
B)24%
C)34%
D)44%
E)54%

Question 66

The body uses the longer omega-3 and omega-6 fatty acids to make substances known as ____________________.

Question 67

A major feature of the Mediterranean diet is liberal intake of ____.

A)eggs
B)olive oil
C)lean meat
D)fortified butter
E)cheese

Question 68

Triglycerides are composed of three fatty acids attached to a(n) ____________________.

Question 69

What is the recommended range of daily fat consumption for an individual on a 2000 calorie diet?

A)5 to 15 grams
B)20 to 35 grams
C)45 to 75 grams
D)80 to 100 grams
E)125 to 150 grams

Question 70

Which statement describes a drawback of olestra consumption?

A)It yields 9 kcalories per gram.
B)It imparts off-flavors to foods.
C)It raises blood glucose levels.
D)It inhibits absorption of vitamin E.
E)It can cause severe constipation.

Question 71

Which statement describes the lipid content of livestock?

A)The meat from grass-fed animals is similar in composition to soy protein.
B)Grass-fed animals contain more omega-3 fats in the meat than grain-fed animals.
C)Grain-fed animals contain more polyunsaturated fatty acids in the meat compared with grass-fed animals.
D)Grain-fed animals contain lower concentrations of fat in the meat compared with grass-fed animals.
E)There are no significant differences between the fat composition of grass and grain fed cattle.

Question 72

Adipose tissue actively secretes several hormones known as ____________________-proteins that help regulate energy balance and influence several body functions.

Question 73

Which statement is true of fat in the diet of athletes?

A)A minimum of 20% fat energy in the diet is needed.
B)Energy derived from fat has very little bearing on performance.
C)Optimal performance is found with a high-carbohydrate, 15% total fat kcalories diet.
D)Diets with at least 10% total kcalories from fat are still able to provide the recommended amounts of micronutrients.
E)It is especially important for female athletes to keep their fat intake to less than 15% of their total kcal.

Question 74

During ____________________, some or all of the points of unsaturation are saturated by adding hydrogen molecules. .

Question 75

The DRI suggest that linoleic acid provide ____________________ of the daily energy intake and linolenic acid ____________________.

Question 76

Monoglycerides and long-chain fatty acids are emulsified by bile, forming spherical complexes known as ____________________.

Question 77

For most adults, what is the recommended minimum amount of fat that should be consumed, as a percentage of total energy intake?

A)5
B)15
C)20
D)35
E)45

Question 78

The ____________________ are the largest and least dense of the lipoproteins.

Question 79

The best-known phospholipid is ____________________.

Question 80

The average daily cholesterol intake of U.S. women is about ____.

A)134 mg
B)184 mg
C)224 mg
D)274 mg
E)304 mg