Question 1

Amanda consumes approximately 2500 kcal/day.According to recommendations of the Dietary Guidelines (2015-2020),she should limit her saturated fat intake to fewer than ________ kcal/day.

Accepted Answer

The Dietary Guidelines (2015-2020) recommend limiting saturated fat intake to less than 10% of total daily calories. For someone consuming 2500 kcal/day, 10% of that is 250 kcal/day.

Question 2

Reggie consumes approximately 3000 kcal/day.According to recommendations of the Dietary Guidelines (2015-2020),he should limit his saturated fat intake to fewer than ________ kcal/day.

Accepted Answer

C

Question 3

Most lipids have ________ in their chemical structures.

Accepted Answer

Lipids are a diverse group of organic molecules that include fats, oils, waxes, and steroids. Most lipids have fatty acids in their chemical structures, which provide hydrophobic (water-fearing) properties to these molecules. Glucose polymers and amino acids are building blocks of carbohydrates and proteins, respectively, and are not typically found in lipids. Nitrogen and sulfur may be present in some lipids, such as phospholipids and cholesterol, but they are not universal components of all lipids.

Question 4

Which of the following statements is true?

Accepted Answer

A fatty acid is a molecule consisting of a long chain of carbons bonded to hydrogen atoms, with a carboxyl group (-COOH) at one end of the chain. This makes it hydrophobic, or insoluble in water. B is incorrect as glucose is a monosaccharide and cannot be linked together to form a fatty acid. C is incorrect as the acid portion is the carboxyl group, which is located at the alpha end of the fatty acid molecule. D is incorrect as fatty acids are generally hydrophobic and therefore insoluble in water.

Question 5

Which of the following statements is true?

Accepted Answer

Fatty acids in nature usually have even numbers of carbon atoms, typically ranging from 4 to 24.

Question 6

Which of the following statements is true?

Accepted Answer

Fat contributes to the flavor of foods, which is why reducing or eliminating it can often result in less flavorful dishes.

Question 7

Which of the following statements about lipids is true?

Accepted Answer

Lipids are hydrophobic molecules and do not dissolve in water-based substances. However, they do dissolve in organic solvents, such as alcohol and acetone. This property is used in lipid extraction techniques. Option B is incorrect as oil is less dense than water and floats on top of it. Option C is incorrect as lipids do not dissolve in water-based substances like vinegar. Option D is also incorrect as most lipids are actually hydrophobic.

Question 8

________ acid is an omega-3 fatty acid.

Accepted Answer

Eicosapentaenoic acid (EPA) is an omega-3 fatty acid. Stearic acid is an omega-9 fatty acid. Linoleic acid is an omega-6 fatty acid. Lauric acid is a saturated fat.

Question 9

Omega-3 fatty acids ________.

Accepted Answer

Omega-3 fatty acids are polyunsaturated fatty acids that have a double bond at the third carbon from the acid end of the hydrocarbon chain. They are typically found in certain types of fish and can also be obtained through dietary supplements, though it is not necessary for everyone to take them as a supplement. Stearic and lauric acids are not considered omega-3 fatty acids.

Question 10

In the body,lipids ________.

Accepted Answer

Lipids provide insulation against cold temperatures. They help to maintain body temperature by providing a layer of insulation around the body, which keeps the heat in and the cold out.

Question 11

Which of the following fatty acids is an essential fatty acid?

Accepted Answer

Alpha-linolenic acid is an essential fatty acid, meaning it cannot be synthesized by the body and must be obtained through diet. Oleic acid, stearic acid, and palmitic acid can be synthesized by the body, and are therefore not considered essential fatty acids.

Question 12

Major functions of lipids include all of the following EXCEPT ________.

Accepted Answer

Lipids do not stimulate the production of vitamins and minerals. However, they do play a role in the production of steroid hormones, cushioning of the body, and serving as an energy source.

Question 13

Which of the following fatty acids is an essential fatty acid that is polyunsaturated with two double bonds in its structure?

Accepted Answer

Linoleic acid is an essential fatty acid that is polyunsaturated with two double bonds in its structure. Essential fatty acids must be consumed through the diet because our bodies cannot produce them. Stearic acid, oleic acid, and alpha-linolenic acid do not meet these criteria.

Question 14

Subcutaneous fat does not ________.

Accepted Answer

Subcutaneous fat does not stimulate red blood cell production. It does insulate the body against cold temperatures, store energy, and protect against minor bruising.

Question 15

In the body,certain lipids ________.

Accepted Answer

Lipids are a source of energy for the body. When carbohydrates are not readily available, the body uses lipids as an alternative energy source.

Question 16

Sarah consumes approximately 2000 kcal/day.According to recommendations of the 2015-2020 version of the Dietary Guidelines for Americans,she should limit her saturated fat intake to fewer than ________ kcal/day.

Accepted Answer

The 2015-2020 Dietary Guidelines for Americans recommend limiting saturated fat intake to less than 10% of total daily calories. For someone consuming 2000 kcal/day, 10% of that is 200 kcal.

Question 17

________ acid is an essential fatty acid.

Accepted Answer

Linoleic acid is an essential fatty acid because it cannot be produced by the body and must be obtained through the diet. Stearic, palmitic, and lauric acids are not essential fatty acids because the body can produce them.

Question 18

________ acid is an omega-6 fatty acid.

Accepted Answer

Linoleic acid is an omega-6 fatty acid, while eicosapentaenoic acid (A) and docosahexaenoic acid (C) are both omega-3 fatty acids. Alpha-linolenic acid (B) is also an omega-3 fatty acid.

Question 19

Lecithin is a type of ________.

Accepted Answer

Lecithin is a type of phospholipid, which contains a glycerol backbone, two fatty acids, a phosphate group, and choline. It is an important component of cell membranes and plays a significant role in the transportation of nutrients and waste across cell membranes.

Question 20

Which of the following statements about phospholipids is FALSE?

Accepted Answer

Phospholipids have a different chemical structure than cholesterol. While both have a hydrophobic ("water-fearing") portion, cholesterol has a hydrophilic ("water-loving") OH group, while phospholipids have a phosphate group that can form a polar head.

Quiz 6: Lipids: Triglycerides, phospholipids, and Sterols

Amanda consumes approximately 2500 kcal/day.According to recommendations of the Dietary Guidelines (2015-2020) ,she should limit her saturated fat intake to fewer than ________ kcal/day.

Reggie consumes approximately 3000 kcal/day.According to recommendations of the Dietary Guidelines (2015-2020) ,he should limit his saturated fat intake to fewer than ________ kcal/day.

Most lipids have ________ in their chemical structures.

Which of the following statements is true?

Which of the following statements is true?

Which of the following statements is true?

Which of the following statements about lipids is true?

________ acid is an omega-3 fatty acid.

Omega-3 fatty acids ________.

In the body,lipids ________.

Which of the following fatty acids is an essential fatty acid?

Major functions of lipids include all of the following EXCEPT ________.

Which of the following fatty acids is an essential fatty acid that is polyunsaturated with two double bonds in its structure?

Subcutaneous fat does not ________.

In the body,certain lipids ________.

Sarah consumes approximately 2000 kcal/day.According to recommendations of the 2015-2020 version of the Dietary Guidelines for Americans,she should limit her saturated fat intake to fewer than ________ kcal/day.

________ acid is an essential fatty acid.

________ acid is an omega-6 fatty acid.

Lecithin is a type of ________.

Which of the following statements about phospholipids is FALSE?