$$ \mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy} $$

Question 1

Which type of membrane transport is illustrated in the image, and what is the main energy source for this process?

Accepted Answer

Active transport; energy from ATP hydrolysis

Question 2

In the process shown, which ions are being transported into the cell and which are being transported out?

Accepted Answer

K$$^+$$ into the cell, Na$$^+$$ out of the cell

Question 3

What is the primary function of the protein depicted in the image?

Accepted Answer

To maintain the electrochemical gradients of Na$$^+$$ and K$$^+$$ across the plasma membrane

Question 4

Which equation best represents the energy conversion occurring during the transport process shown?

Accepted Answer

$$ \mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy} $$

Question 5

If the sodium-potassium pump (shown in the image) stops functioning, what is the most likely immediate effect on the cell?

Accepted Answer

The concentration gradients of Na$$^+$$ and K$$^+$$ across the membrane will dissipate

Question 6

Which of the following best describes the direction of sodium and potassium ion movement by the pump?

Accepted Answer

3 Na$$^+$$ out, 2 K$$^+ in$$

Question 7

Why is the sodium-potassium pump considered an example of active transport?

Accepted Answer

It requires energy input from ATP to move ions against their concentration gradients

Question 8

Which of the following would most likely occur if ATP was not available to the protein shown in the image?

Accepted Answer

The pump would stop, and Na$$^+$$ would accumulate inside the cell

Question 9

Which of the following best explains why nerve and muscle cells require the sodium-potassium pump to function properly?

Accepted Answer

To establish and maintain the membrane potential necessary for electrical signaling

Question 10

If a toxin blocked the protein shown in the image, which of the following would be the most immediate effect on the cell's membrane potential?

Accepted Answer

The membrane potential would decrease (become less negative)

Cell Membrane Transport: Diffusion, Osmosis, and Active Transport

Study Guide - Practice Questions