Question 1

Which of the following best describes the primary function of microvilli on the surface of epithelial cells in the small intestine?

Accepted Answer

They enhance the absorption of nutrients by increasing surface area.

Question 2

A patient has a genetic disorder that results in defective integral proteins in the cell membrane. Which of the following cellular processes is most likely to be directly affected?

Accepted Answer

Selective permeability and regulated exchange with the environment

Question 3

Which component of the cell membrane is primarily responsible for the membrane's fluidity and flexibility?

Accepted Answer

Cholesterol

Question 4

A researcher observes that a certain molecule can cross the cell membrane without the assistance of a protein channel. Which property is most likely true of this molecule?

Accepted Answer

It is small and nonpolar.

Question 5

Which of the following best explains why the phospholipid bilayer forms the basic structure of the cell membrane?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, causing them to arrange in a bilayer.

Question 6

A cell is placed in a solution with a high concentration of glucose. Over time, glucose moves into the cell until equilibrium is reached. Which process is responsible for this movement?

Accepted Answer

Diffusion

Question 7

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Synthesis of proteins

Question 8

A toxin disrupts the hydrophobic interactions in the cell membrane. Which part of the membrane is most directly affected?

Accepted Answer

The fatty acid tails of phospholipids

Question 9

Which of the following best describes the role of membrane proteins acting as receptors?

Accepted Answer

They detect chemical signals and initiate cellular responses.

Question 10

A cell membrane is described as 'selectively permeable.' What does this mean?

Accepted Answer

It allows some substances to pass while restricting others.

Question 11

Which equation best represents the net movement of molecules during diffusion?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 12

If a cell's membrane loses its cholesterol content, which of the following is the most likely consequence?

Accepted Answer

The membrane becomes less flexible and more prone to rupture.

Question 13

Which of the following best explains why ions such as Na$$^+$$ and K$$^+$$ require protein channels to cross the cell membrane?

Accepted Answer

They are charged and cannot pass through the hydrophobic core of the lipid bilayer.

Question 14

A scientist observes that after a certain drug is administered, cells lose their ability to adhere to each other. Which membrane component is most likely affected?

Accepted Answer

Surface proteins involved in cellular adhesion

Question 15

Which of the following scenarios best illustrates the concept of selective permeability in a real-life medical context?

Accepted Answer

A patient receives an IV solution containing isotonic saline, which does not cause cells to shrink or swell.

Question 16

Which of the following statements about diffusion across the cell membrane is correct?

Accepted Answer

Diffusion continues until the concentration gradient is eliminated.

Question 17

A mutation causes the loss of glycolipids from the cell membrane. Which function is most likely to be impaired?

Accepted Answer

Cellular recognition and communication

Question 18

Which of the following best describes the arrangement of hydrophilic and hydrophobic regions in the phospholipid bilayer?

Accepted Answer

Hydrophilic heads face outward toward the aqueous environments, and hydrophobic tails face inward.

Question 19

A cell is exposed to a toxin that blocks all protein channels in the membrane. Which of the following is the most immediate effect?

Accepted Answer

Ions and polar molecules cannot enter or exit the cell.

Question 20

Which of the following is a direct consequence of the cell membrane's sensitivity function?

Accepted Answer

Cells can respond to hormones and neurotransmitters in their environment.

Cell Membrane Structure and Function: Foundations of Cellular Anatomy

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