Q: Which of the following equations best represents the hydrolysis of ATP that powers the sodium-potassium pump?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following best describes the function of the sodium-potassium pump as shown in the first image?

Accepted Answer

It moves sodium ions out of the cell and potassium ions into the cell using ATP as an energy source.

Question 2

What is the main energy source for primary active transport, such as the sodium-potassium pump?

Accepted Answer

ATP

Question 3

In the Na$$^+-$$glucose symporter shown in the second image, which statement is correct?

Accepted Answer

Sodium moves down its concentration gradient, providing energy for glucose to move against its gradient.

Question 4

Which process is illustrated in the third image, and what is its main feature?

Accepted Answer

Receptor-mediated endocytosis; it uses specific receptors to internalize particular molecules.

Question 5

Which of the following best describes pinocytosis as shown in the fourth image?

Accepted Answer

The cell engulfs fluids and dissolved substances by forming small vesicles.

Question 6

Phagocytosis, as shown in the fifth image, is best described as:

Accepted Answer

The process by which the cell engulfs large particles or even whole cells.

Question 7

Which of the following equations best represents the hydrolysis of ATP that powers the sodium-potassium pump?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 8

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

Accepted Answer

It always involves the movement of water molecules.

Question 9

A cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 10

Which of the following best explains why the sodium-potassium pump is considered an electrogenic pump?

Accepted Answer

It creates a net movement of charge across the membrane, contributing to membrane potential.

Question 11

Which process is responsible for the secretion of digestive enzymes from pancreatic cells into the small intestine?

Accepted Answer

Exocytosis

Question 12

Which of the following statements about aquaporins is correct, as referenced in the last image?

Accepted Answer

Aquaporins are channel proteins that facilitate the rapid movement of water across cell membranes.

Question 13

A mutation causes a cell to lack functional receptor proteins on its surface. Which process would be most directly affected?

Accepted Answer

Receptor-mediated endocytosis

Question 14

Which of the following best describes the difference between symporters and antiporters?

Accepted Answer

Symporters move two substances in the same direction, while antiporters move them in opposite directions.

Question 15

Which of the following is an example of secondary active transport?

Accepted Answer

Na$$^+-$$glucose symporter

Question 16

If a cell's sodium-potassium pumps are inhibited, what is the most likely immediate effect?

Accepted Answer

The cell will lose its membrane potential due to disrupted ion gradients.

Question 17

Which of the following best describes the process of exocytosis?

Accepted Answer

The cell releases substances to the outside by fusing vesicles with the plasma membrane.

Question 18

Which of the following terms refers to the difference in charge and chemical concentration across a membrane?

Accepted Answer

Electrochemical gradient

Question 19

A cell uses a symporter to move glucose into the cell against its concentration gradient. Which of the following must also occur for this process to work?

Accepted Answer

Sodium ions must move into the cell down their concentration gradient.

Question 20

Which of the following best explains why the sodium-potassium pump is essential for nerve cell function?

Accepted Answer

It maintains the resting membrane potential necessary for action potentials.

Membrane Transport Mechanisms: Active Transport, Cotransport, and Bulk Transport

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