Question 1

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

They are not composed of repeating monomer subunits.

Question 2

A fat molecule (triglyceride) is formed by joining three fatty acids to a glycerol molecule. What type of bond is formed during this process, and what is released as a byproduct?

Accepted Answer

An ester linkage is formed and water is released.

Question 3

Which structural feature of fatty acids is responsible for the difference in physical state (solid vs. liquid) between saturated and unsaturated fats at room temperature?

Accepted Answer

The presence of cis double bonds in unsaturated fatty acids causes kinks, preventing tight packing.

Question 4

A patient is diagnosed with atherosclerosis, a condition involving plaque deposits in arteries. Which dietary component is most likely to have contributed to this condition?

Accepted Answer

A diet high in saturated fats

Question 5

Which of the following statements about phospholipids is correct?

Accepted Answer

They are amphipathic, containing both hydrophobic tails and a hydrophilic head.

Question 6

What is the primary biological function of fats in animals?

Accepted Answer

Long-term energy storage

Question 7

Which of the following best describes the arrangement of phospholipids in a cell membrane?

Accepted Answer

A bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward

Question 8

Which of the following is NOT a function of adipose tissue in animals?

Accepted Answer

Synthesis of steroid hormones

Question 9

A researcher is studying a molecule with four fused carbon rings and various functional groups attached. This molecule is most likely a:

Accepted Answer

Steroid

Question 10

Which of the following statements about essential fatty acids is true?

Accepted Answer

They must be obtained from the diet because the human body cannot synthesize them.

Question 11

If a cell membrane were composed entirely of saturated fatty acids, what would be the most likely effect on membrane fluidity at room temperature?

Accepted Answer

The membrane would be less fluid due to tight packing of the fatty acid chains.

Question 12

Which of the following best explains why fats store more energy per gram than polysaccharides?

Accepted Answer

Fats have more nonpolar carbon-hydrogen bonds, which store more chemical energy.

Question 13

A scientist wants to isolate the heaviest component of a cell membrane. Which protocol should they use?

Accepted Answer

Extract phospholipids, as they are the heaviest component.

Question 14

Which of the following is a correct statement about the hydrophobic region of a phospholipid?

Accepted Answer

It consists of the two fatty acid tails.

Question 15

Which of the following is a real-life example of the importance of subcutaneous fat in animals?

Accepted Answer

Marine mammals like whales use subcutaneous fat for insulation in cold water.

Question 16

Which of the following statements about cholesterol is correct?

Accepted Answer

It is a steroid that is a component of animal cell membranes.

Question 17

A food manufacturer hydrogenates vegetable oil, converting some of its cis double bonds to trans double bonds. What is a likely health consequence of consuming this product?

Accepted Answer

Increased risk of cardiovascular disease due to trans fats.

Question 18

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 19

Which of the following is NOT a characteristic of saturated fatty acids?

Accepted Answer

They contain one or more carbon-carbon double bonds.

Question 20

A triacylglycerol molecule can have fatty acids that are:

Accepted Answer

All the same or different from each other.

Lipids: Structure, Types, and Biological Importance

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