Q: Which of the following equations correctly represents the stoichiometry of the Na⁺/K⁺ ATPase pump?

$3\ \mathrm{Na}^+_{\text{out}} : 2\ \mathrm{K}^+_{\text{in}} : 1\ \mathrm{ATP}$

Question 1

Which of the following best describes the function of the plasma membrane in a typical human cell?

Accepted Answer

It is a flexible boundary that selectively regulates the movement of substances into and out of the cell.

Question 2

A patient is diagnosed with a genetic disorder that affects the function of their Na⁺/K⁺ ATPase pumps. Which of the following cellular processes would be most directly impaired?

Accepted Answer

Primary active transport of sodium and potassium ions

Question 3

Which of the following is a correct example of secondary active transport in human cells?

Accepted Answer

Movement of glucose into a cell using the sodium gradient established by the Na⁺/K⁺ pump

Question 4

Which of the following best explains why steroid hormones can diffuse directly through the plasma membrane?

Accepted Answer

Steroid hormones are lipid-soluble and can pass through the hydrophobic core of the membrane.

Question 5

A researcher observes that certain cells in the gastrointestinal tract are tightly joined together, preventing leakage of digestive enzymes between them. Which type of cell junction is most likely responsible for this function?

Accepted Answer

Tight junctions

Question 6

Which of the following best describes the role of the glycocalyx on the surface of a cell?

Accepted Answer

It acts as a highly specific cell recognition marker for the immune system.

Question 7

A nerve cell (neuron) rapidly transmits electrical signals to other cells. Which specialized cell junction allows for the direct passage of ions and electrical signals between adjacent nerve cells?

Accepted Answer

Gap junctions

Question 8

Which of the following is an example of carrier-mediated facilitated diffusion?

Accepted Answer

Transport of glucose into a cell via a specific protein that changes shape

Question 9

During osmosis, which of the following statements is correct?

Accepted Answer

Water moves from an area of low solute concentration to an area of high solute concentration.

Question 10

A white blood cell engulfs a bacterium by surrounding it with its plasma membrane and forming a vesicle. This process is best described as:

Accepted Answer

Phagocytosis

Question 11

Which of the following equations correctly represents the stoichiometry of the Na⁺/K⁺ ATPase pump?

Accepted Answer

$3\ \mathrm{Na}^+_{	ext{out}} : 2\ \mathrm{K}^+_{	ext{in}} : 1\ \mathrm{ATP}$

Question 12

A cell is placed in a solution and water begins to move into the cell, causing it to swell. Which of the following best describes the tonicity of the solution relative to the cell?

Accepted Answer

The solution is hypotonic to the cell.

Question 13

Which of the following best explains why facilitated diffusion is considered a passive process?

Accepted Answer

It relies on carrier or channel proteins but does not require cellular energy.

Question 14

A hormone binds to a receptor on the cell membrane, triggering a cascade of intracellular events. Which type of membrane protein is directly involved in this process?

Accepted Answer

Integral protein acting as a receptor

Question 15

Which of the following scenarios best illustrates the function of desmosomes?

Accepted Answer

Cardiac muscle cells resist tearing during contraction due to strong anchoring junctions.

Question 16

Which of the following best describes the difference between phagocytosis and pinocytosis?

Accepted Answer

Phagocytosis engulfs large particles; pinocytosis engulfs extracellular fluid and dissolved solutes.

Question 17

Which of the following is NOT a function of integral membrane proteins?

Accepted Answer

Providing mechanical support outside the membrane

Question 18

A cell needs to secrete a large amount of hormone into the bloodstream. Which process will it most likely use?

Accepted Answer

Exocytosis

Question 19

Which of the following factors would NOT increase the rate of simple diffusion across the plasma membrane?

Accepted Answer

Lowering the temperature

Question 20

A patient is given a drug that blocks all channel proteins in the plasma membrane. Which of the following processes would be most directly affected?

Accepted Answer

Facilitated diffusion of ions

Cell Structure, Function, and Diversity

Study Guide - Practice Questions

Study Guide - Flashcards