Q: Which of the following equations represents the formation of a triglyceride from glycerol and fatty acids?

$$\text{Glycerol} + 3\ \text{Fatty Acids} \rightarrow \text{Triglyceride} + 3\ \text{H}_2\text{O}$$

Question 1

Which of the following best explains why lipids are insoluble in water?

Accepted Answer

Lipids are composed mostly of hydrocarbon regions, making them nonpolar and unable to form hydrogen bonds with water.

Question 2

A triglyceride is formed by which type of chemical reaction?

Accepted Answer

Dehydration synthesis, where three fatty acids are joined to glycerol by ester linkages and three water molecules are released.

Question 3

Which of the following statements about saturated and unsaturated fats is correct?

Accepted Answer

Saturated fats have no double bonds between carbon atoms and are solid at room temperature.

Question 4

What is the main structural difference between cis and trans unsaturated fatty acids?

Accepted Answer

Cis fatty acids have hydrogen atoms on the same side of the double bond, causing a bend, while trans fatty acids have hydrogens on opposite sides, making the chain straighter.

Question 5

Which of the following best describes the role of phospholipids in biological membranes?

Accepted Answer

They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward, creating a selective barrier.

Question 6

A patient is diagnosed with atherosclerosis due to plaque buildup in their arteries. Which dietary component is most likely to have contributed to this condition?

Accepted Answer

A diet high in saturated and trans fats.

Question 7

Which of the following is a function of adipose tissue in mammals?

Accepted Answer

Energy storage, insulation, and cushioning of vital organs.

Question 8

What is the effect of hydrogenation on vegetable oils?

Accepted Answer

It converts unsaturated fats to saturated fats and can create trans fats.

Question 9

Which molecule is a precursor for the synthesis of steroid hormones in animals?

Accepted Answer

Cholesterol

Question 10

A cell membrane is primarily composed of which type of lipid?

Accepted Answer

Phospholipids

Question 11

Which of the following best explains why fish and plant fats are usually liquid at room temperature?

Accepted Answer

They contain unsaturated fatty acids with one or more double bonds, causing kinks that prevent tight packing.

Question 12

Which of the following equations represents the formation of a triglyceride from glycerol and fatty acids?

Accepted Answer

$$	ext{Glycerol} + 3\ 	ext{Fatty Acids} ightarrow 	ext{Triglyceride} + 3\ 	ext{H}_2	ext{O}$$

Question 13

Which of the following is NOT a function of lipids in the human body?

Accepted Answer

Catalyzing chemical reactions as enzymes.

Question 14

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

Accepted Answer

They have both hydrophilic heads and hydrophobic tails.

Question 15

A person switches from a diet high in animal fats to one high in olive oil and nuts. Which change in blood lipid profile is most likely?

Accepted Answer

Decrease in LDL cholesterol and increase in HDL cholesterol.

Question 16

Which of the following statements about cholesterol is correct?

Accepted Answer

It is a component of animal cell membranes and a precursor for steroid synthesis.

Question 17

Which of the following best explains why myelin sheaths are important for nerve function?

Accepted Answer

They insulate nerve fibers, allowing for faster transmission of electrical signals.

Question 18

Which of the following foods is most likely to increase your intake of trans fats?

Accepted Answer

Margarine made from hydrogenated vegetable oils.

Question 19

Which of the following best describes the effect of trans fats on human health?

Accepted Answer

They increase the risk of cardiovascular disease more than saturated fats.

Biomolecules: Lipids – Structure, Types, and Biological Roles

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