Question 1

Which of the following best describes the current model of the cell membrane?

Accepted Answer

A double layer (bilayer) of phospholipids with proteins inserted throughout, known as the fluid mosaic model.

Question 2

Which of the following statements about membrane lipids is CORRECT?

Accepted Answer

Sphingolipids are commonly associated with lipid-anchored proteins.

Question 3

Which of the following is a function of glycoproteins in the cell membrane?

Accepted Answer

Serving as recognition sites for cell-to-cell interactions.

Question 4

A solution with an osmolarity of 400 mOsm is placed next to a solution with an osmolarity of 300 mOsm, separated by a membrane permeable to water but not solute. What will happen to the water movement?

Accepted Answer

Water will move from the 300 mOsm solution to the 400 mOsm solution.

Question 5

Which of the following best explains why the resting membrane potential of most cells is close to $$-70\ \mathrm{mV}$$?

Accepted Answer

There are more potassium leak channels than sodium leak channels, allowing more K$$^+ to $$leave the cell.

Question 6

Which of the following is TRUE regarding the distribution of water in the human body?

Accepted Answer

About 60% of the body is water, with the majority in the intracellular fluid compartment.

Question 7

Which of the following is a characteristic of lipid rafts in the cell membrane?

Accepted Answer

They are associated with a high concentration of proteins involved in cell signaling.

Question 8

Which of the following best describes the role of cholesterol in the cell membrane?

Accepted Answer

It adds flexibility and decreases permeability to small water-soluble molecules.

Question 9

Which of the following statements about membrane proteins is INCORRECT?

Accepted Answer

Each cell contains only one type of membrane protein.

Question 10

Which of the following best explains why the extracellular surface of the cell membrane contains glycoproteins and glycolipids?

Accepted Answer

To serve as recognition and interaction sites for cell-to-cell communication.

Question 11

Which of the following is TRUE regarding osmotic equilibrium in the body?

Accepted Answer

Osmotic equilibrium refers to equal fluid concentration (amount of solute per volume) across compartments.

Question 12

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

Accepted Answer

They have both a hydrophilic head and a hydrophobic tail.

Question 13

Which of the following is a correct statement about the composition of cell membranes?

Accepted Answer

The more metabolically active a membrane is, the more protein it contains.

Question 14

Which of the following is a function of peripheral membrane proteins?

Accepted Answer

Participating in intracellular signaling and forming the submembranous cytoskeleton.

Question 15

Which of the following best describes the difference between isosmotic, hyperosmotic, and hyposmotic solutions?

Accepted Answer

Hyperosmotic solutions have a higher osmolarity than the comparison solution.

Cell Membranes and Body Fluid Compartments: Structure, Composition, and Dynamics

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