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

Question 1

Which of the following best describes the structural difference between a triglyceride and a phospholipid, as shown in the diagrams?

Accepted Answer

A triglyceride contains three fatty acid tails, while a phospholipid contains two fatty acid tails and a phosphate group.

Question 2

Which component of a phospholipid is responsible for its hydrophilic (water-attracting) properties?

Accepted Answer

The phosphate-containing head

Question 3

Which of the following statements about triglycerides is correct?

Accepted Answer

Triglycerides are the main form of fat stored in the body and consist of one glycerol molecule attached to three fatty acids.

Question 4

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers in water.

Question 5

If a fatty acid tail in a phospholipid contains a double bond, what effect does this have on the structure of the tail?

Accepted Answer

It introduces a bend or kink in the tail, making it unsaturated.

Question 6

Which of the following is a function of triglycerides in the human body?

Accepted Answer

They provide energy storage and insulation.

Question 7

A patient has a genetic disorder that prevents the formation of phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

Cell membrane

Question 8

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

Accepted Answer

They contain both hydrophilic and hydrophobic regions.

Question 9

Which of the following statements about the fatty acid tails in the phospholipid diagram is correct?

Accepted Answer

One tail is saturated (straight), and one is unsaturated (bent).

Question 10

Which of the following equations correctly represents the formation of a triglyceride from its components?

Accepted Answer

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

Question 11

Which property of phospholipids allows them to form the lipid bilayer of cell membranes?

Accepted Answer

Their hydrophilic heads face water while their hydrophobic tails face inward, away from water.

Question 12

Which of the following best explains why triglycerides are not a major component of cell membranes?

Accepted Answer

Triglycerides are entirely hydrophobic and cannot form bilayers in water.

Carbohydrates, Lipids, Proteins, and Alcohol: GOB Chemistry Study Notes

Study Guide - Practice Questions