Q: Which equation best represents the structure of a triglyceride?

$$\mathrm{Triglyceride} = \mathrm{Glycerol} + 3 \times \mathrm{Fatty\ Acid}$$

Question 1

Which property of phospholipids allows them to form bilayers in aqueous environments?

Accepted Answer

They are amphipathic, containing both hydrophilic and hydrophobic regions

Question 2

A cell membrane is described as a 'fluid mosaic.' Which component is primarily responsible for the fluidity of the membrane at room temperature?

Accepted Answer

Highly unsaturated lipids

Question 3

Which of the following statements best explains why saturated fats are solid at room temperature?

Accepted Answer

Saturated fats have straight hydrocarbon chains that pack tightly together

Question 4

A patient is found to have a genetic mutation that prevents the addition of phosphate groups to membrane lipids. Which class of membrane lipid would be most affected?

Accepted Answer

Phospholipids

Question 5

Which of the following best describes the role of blue hexagons shown on the cell membrane diagram?

Accepted Answer

They represent cell recognition molecules that help the immune system distinguish self from non-self

Question 6

Which of the following is NOT a major type of lipid found in cell membranes?

Accepted Answer

Triglycerides

Question 7

A fatty acid is defined as:

Accepted Answer

A hydrocarbon chain bonded to a carboxyl group

Question 8

Which of the following statements about membrane lipids is correct?

Accepted Answer

Membrane lipids are amphipathic, having both hydrophilic and hydrophobic regions

Question 9

If a cell membrane contained only highly saturated fatty acids, what would be the most likely effect on the membrane's physical properties?

Accepted Answer

The membrane would be less fluid and more rigid

Question 10

Which equation best represents the structure of a triglyceride?

Accepted Answer

$$\mathrm{Triglyceride} = \mathrm{Glycerol} + 3 	imes \mathrm{Fatty\ Acid}$$

Question 11

Which of the following best explains why unsaturated fats are liquid at room temperature?

Accepted Answer

Unsaturated fats have one or more double bonds that create kinks, preventing tight packing

Question 12

Steroids are characterized by which structural feature?

Accepted Answer

Bulky, four-ring structure

Question 13

Which of the following is a correct statement about glycolipids?

Accepted Answer

Glycolipids are lipids made of two fatty acids and two sugars

Question 14

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

Accepted Answer

Hydrophilic heads face both the cytoplasm and extracellular space, while hydrophobic tails face inward toward each other

Question 15

A scientist adds a large amount of cholesterol to a cell membrane. What is the most likely effect on membrane fluidity at high temperatures?

Accepted Answer

Membrane fluidity will decrease

Question 16

Which of the following is true about the solubility of lipids?

Accepted Answer

Lipids are largely nonpolar and hydrophobic, but dissolve in nonpolar solvents like benzene

Question 17

Which of the following is a function of membrane-bound organelles in eukaryotic cells?

Accepted Answer

They create compartments that facilitate chemical reactions necessary for life

Question 18

Which of the following best describes the amphipathic nature of membrane lipids?

Accepted Answer

They have both hydrophilic and hydrophobic regions

Question 19

Which of the following equations correctly represents the general structure of a phospholipid?

Accepted Answer

$$\mathrm{Phospholipid} = \mathrm{Glycerol} + 2 	imes \mathrm{Fatty\ Acid} + \mathrm{Phosphate\ Group}$$

Cell Membranes and Membrane Lipids: Structure and Function

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