Question 1

Most lipids have _____ in their chemical structures.

Accepted Answer

Lipids are composed of fatty acids, which are long chains of hydrocarbons with a carboxyl group at one end. This characteristic structure gives lipids their hydrophobic nature and makes them insoluble in water. Lipids also commonly contain other functional groups such as esters, ethers, and alcohols.

Question 2

_____ acid is an omega-3 fatty acid.

Accepted Answer

Docosahexaenoic acid (DHA) is an omega-3 fatty acid that is commonly found in fatty fish and some seaweed. It is important for brain function and development, as well as overall health. Lauric acid (A) is a medium-chain saturated fat found in coconut oil and palm kernel oil. Stearic acid (C) is a saturated fatty acid found in animal fats and cocoa butter. Linoleic acid (D) is an omega-6 fatty acid found in vegetable oils and some animal products.

Question 3

Which of the following lipoproteins contains the highest percentage of cholesterol?

Accepted Answer

LDL (low-density lipoprotein) contains the highest percentage of cholesterol among the lipoproteins. It is often referred to as "bad cholesterol" as high levels of LDL can lead to the buildup of plaque in the arteries and increase the risk of cardiovascular disease.

Question 4

Which of the following statements is true?

Accepted Answer

Fat contributes to the flavor of foods, enhancing taste and texture.

Question 5

In the body,lipids _____.

Accepted Answer

Lipids are a major component of cell membranes and play a crucial role in maintaining their structure and function. They also provide insulation, energy storage, and serve as precursors for various hormones and signaling molecules.

Question 6

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 that saturated fat intake should be less than 10% of total daily calories. For a 2500 kcal/day diet, this equates to fewer than 250 kcal/day from saturated fats.

Question 7

Lecithin is a type of _____.

Accepted Answer

Lecithin is a phospholipid, which consists of a polar head (containing a phosphate group) and non-polar tail (containing fatty acids).

Question 8

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

The Dietary Guidelines recommend that saturated fat intake should be less than 10% of total daily calories. For a 3000 kcal/day diet, this equates to fewer than 300 kcal/day from saturated fats.

Question 9

Subcutaneous fat does not _____.

Accepted Answer

Subcutaneous fat does not stimulate red blood cell production. It primarily stores energy, insulates the body against cold temperatures, and protects against minor bruising.

Question 10

_____ acid is an essential fatty acid.

Accepted Answer

Linoleic acid is an essential fatty acid, meaning it cannot be produced by the body and must be obtained through diet. Lauric, stearic, and palmitic acids are not essential fatty acids as the body can produce them.

Question 11

A chylomicron is a type of _____.

Accepted Answer

Chylomicron is a type of lipoprotein that transports lipids, including triglycerides, from the small intestine to other parts of the body. Lipoproteins are made up of lipids and proteins and are involved in the transport of lipids through the bloodstream. Phospholipids, sterols, and fatty acids are lipid molecules that can be found in chylomicrons, but they are not the primary structure of a chylomicron.

Question 12

_____ acid is an omega-6 fatty acid.

Accepted Answer

Linoleic acid is an omega-6 polyunsaturated fatty acid that is essential for human health, as it cannot be produced by the body and must be obtained from the diet. Eicosapentaenoic and docosahexaenoic acids are omega-3 fatty acids, and alpha-linolenic acid is another omega-3 fatty acid that can be converted into EPA and DHA in the body.

Question 13

In the body,certain lipids _____.

Accepted Answer

Lipids, commonly known as fats, are a source of energy for the body. When consumed or stored, they can be broken down into molecules that provide the body with energy to perform various functions. Lipids also play a role in insulation and protection of organs. However, they do not stimulate the production of vitamins, make minerals nor are necessary for the absorption of dietary fiber.

Question 14

_____ acid is an omega-3 fatty acid.

Accepted Answer

Eicosapentaenoic acid (EPA) is an omega-3 fatty acid. The other options are not omega-3 fatty acids.

Question 15

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

Accepted Answer

Essential fatty acids cannot be synthesized by the body and must be obtained from the diet. Alpha-linolenic acid is an essential omega-3 fatty acid. Stearic acid, oleic acid, and palmitic acid are non-essential fatty acids that can be synthesized by the body.

Question 16

According to the 2015-2020 version of the Dietary Guidelines,healthy adults should consume _________.

Accepted Answer

The 2015-2020 version of the Dietary Guidelines recommends that healthy adults consume as little cholesterol as possible while following a healthy diet. While there is no set limit on the amount of cholesterol that should be consumed, it is recommended to keep intake as low as possible due to its potential link to heart disease. Therefore, choice D is the best answer.

Question 17

Which of the following statements is true?

Accepted Answer

Fatty acids are composed of a long hydrocarbon chain (containing only carbon and hydrogen atoms) with a carboxyl group (-COOH) at one end, which is known as the alpha end. Therefore, the omega end of a fatty acid molecule is the end of the hydrocarbon chain opposite the carboxyl group (i.e., the methyl end). This is not the acid portion of the molecule, as the acid portion is the carboxyl group at the alpha end. Option A is incorrect. Option B is also incorrect because fatty acids are generally not water soluble, as they are hydrophobic (water-fearing) molecules. Option C is incorrect because fatty acids are not polymers of glucose molecules, but rather a type of lipid.

Question 18

In the body,lipids _____.

Accepted Answer

Lipids provide insulation against cold temperatures by creating a layer of fat beneath the skin. The other choices are incorrect as lipids do not directly stimulate vitamin and mineral production, are not needed for fiber absorption, and do not assist in proper cholesterol digestion (although they can contribute to cholesterol levels in the body).

Question 19

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

According to the 2015-2020 version of the Dietary Guidelines for Americans, saturated fat intake should make up no more than 10% of daily caloric intake. For Sarah, who consumes approximately 2000 kcal/day, this would be a limit of 200 kcal/day from saturated fat (10% of 2000 kcal/day). Converted to grams, this would be about 22 g/day. Since 1 gram of fat provides 9 kcal, 200 kcal would be equivalent to about 22 g/day of saturated fat. Therefore, Sarah should limit her saturated fat intake to fewer than 200 kcal/day.

Question 20

Which of the following statements is true?

Accepted Answer

In nature, fatty acids typically have even numbers of carbon atoms. This is due to the way that they are synthesized in living organisms.

Quiz 6: The Lipids: Triglycerides, phospholipids, and Sterols

Most lipids have _____ in their chemical structures.

_____ acid is an omega-3 fatty acid.

Which of the following lipoproteins contains the highest percentage of cholesterol?

Which of the following statements is true?

In the body,lipids _____.

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.

Lecithin is a type of _____.

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.

Subcutaneous fat does not _____.

_____ acid is an essential fatty acid.

A chylomicron is a type of _____.

_____ acid is an omega-6 fatty acid.

In the body,certain lipids _____.

_____ acid is an omega-3 fatty acid.

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

According to the 2015-2020 version of the Dietary Guidelines,healthy adults should consume _________.

Which of the following statements is true?

In the body,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.

Which of the following statements is true?