$$\text{Glycerol-3-phosphate} + 2 \text{Fatty acids} + \text{Ethanolamine} \rightarrow \text{Phosphatidylethanolamine} + 2 \text{H}_2\text{O}$$

$$\text{Glycerol} + 2 \text{Fatty acids} + \text{Phosphate group} + \text{Variable head group}$$

Question 1

Which of the following best describes a phospholipid?

Accepted Answer

A lipid containing two fatty acids and a phosphate group attached to a glycerol backbone.

Question 2

What is the defining structural feature of glycerophospholipids?

Accepted Answer

A glycerol backbone with two fatty acids and a phosphate group attached.

Question 3

Which of the following is a common head group found in glycerophospholipids?

Accepted Answer

Ethanolamine

Question 4

A phosphatidylcholine molecule contains which of the following head groups?

Accepted Answer

Choline

Question 5

Which of the following equations correctly represents the formation of a phosphatidylethanolamine?

Accepted Answer

$$	ext{Glycerol-3-phosphate} + 2 	ext{Fatty acids} + 	ext{Ethanolamine} ightarrow 	ext{Phosphatidylethanolamine} + 2 	ext{H}_2	ext{O}$$

Question 6

Which of the following is NOT a variable head group found in glycerophospholipids?

Accepted Answer

Glucose

Question 7

Which class of glycerophospholipid is also known as cardiolipin?

Accepted Answer

Diphosphatidylglycerol

Question 8

Which of the following statements about the fatty acid composition of glycerophospholipids is correct?

Accepted Answer

Fatty acid chain length and degree of saturation can alter the properties and function of the glycerophospholipid.

Question 9

Which of the following best explains why phospholipids are major components of cell membranes?

Accepted Answer

Their amphipathic nature allows them to form bilayers, creating a selective barrier.

Question 10

A mutation causes a cell to produce phospholipids lacking a phosphate group. What is the most likely consequence for the cell membrane?

Accepted Answer

The membrane would lose its amphipathic properties and become less effective as a barrier.

Question 11

Which of the following is the correct structure for phosphatidylserine?

Accepted Answer

A glycerol backbone with two fatty acids, a phosphate group, and a serine head group.

Question 12

Which of the following best describes the role of phosphatidylinositol in cell signaling?

Accepted Answer

It can be phosphorylated to produce signaling molecules involved in intracellular pathways.

Question 13

Which of the following is the correct general formula for a glycerophospholipid?

Accepted Answer

$$	ext{Glycerol} + 2 	ext{Fatty acids} + 	ext{Phosphate group} + 	ext{Variable head group}$$

Question 14

Which of the following best explains the difference between phosphatidylcholine and phosphatidylethanolamine?

Accepted Answer

They have different variable head groups attached to the phosphate.

Question 15

Which of the following is a direct precursor to all other glycerophospholipids?

Accepted Answer

Phosphatidic acid

Glycerophospholipids: Structure, Classes, and Biological Roles

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