Question 1

Which of the following statements best describes passive transport across a biological membrane?

Accepted Answer

It moves substances down their concentration gradient without using cellular energy.

Question 2

Active transport is characterized by which of the following features?

Accepted Answer

Utilization of ATP to move substances against their concentration gradient.

Question 3

A cell is placed in a solution with a higher concentration of glucose outside than inside. Which transport process will most likely move glucose into the cell without energy expenditure?

Accepted Answer

Facilitated diffusion

Question 4

Which equation correctly represents the energy requirement for active transport?

Accepted Answer

$$ \Delta G \u003e 0 $$

Question 5

A symporter is a membrane protein that:

Accepted Answer

Transports two molecules in the same direction.

Question 6

Which of the following best describes an antiporter?

Accepted Answer

Transports two molecules in opposite directions.

Question 7

A transporter that requires ATP to move two molecules A and B out of the cell is best described as:

Accepted Answer

An active antiporter

Question 8

Which of the following is NOT a characteristic of passive transport?

Accepted Answer

Movement against a concentration gradient

Question 9

In the context of membrane transport, what is the primary difference between facilitated diffusion and active transport?

Accepted Answer

Active transport requires energy input, while facilitated diffusion does not.

Question 10

Which of the following scenarios best illustrates the function of a uniporter?

Accepted Answer

Transporting glucose into the cell without coupling to another molecule.

Question 11

A patient is diagnosed with a genetic disorder that impairs the function of ATPase pumps in their cell membranes. Which process would be most affected?

Accepted Answer

Active transport of sodium ions

Question 12

Which of the following best explains why active transport is necessary for cells?

Accepted Answer

To maintain concentration gradients essential for cellular function

Question 13

Which of the following membrane proteins would be responsible for transporting two different ions in opposite directions simultaneously?

Accepted Answer

Antiporter

Question 14

If a cell needs to import glucose against its concentration gradient, which type of transport would it use?

Accepted Answer

Active transport

Question 15

Which of the following is a real-life example of active transport in human physiology?

Accepted Answer

Sodium-potassium pump maintaining ion gradients in neurons

Question 16

Which process is most likely to occur when a cell is placed in a hypotonic solution?

Accepted Answer

Passive diffusion of water into the cell

Question 17

Which of the following best describes the role of ATP in active transport?

Accepted Answer

ATP is hydrolyzed to provide energy for moving molecules against their concentration gradient.

Question 18

A cell uses a symporter to import sodium and glucose together. If sodium moves down its concentration gradient, what type of transport is this for glucose?

Accepted Answer

Active transport (secondary active transport)

Question 19

Which of the following is true regarding the movement of molecules by passive transport?

Accepted Answer

It relies on the inherent kinetic energy of molecules.

Question 20

Which of the following best describes the function of a membrane protein classified as a uniporter?

Accepted Answer

It transports a single type of molecule across the membrane.

Passive vs. Active Transport Across Biological Membranes

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