Q: Which equation best describes the direction of water movement during osmosis?

$$\text{Water moves from an area of lower solute concentration to higher solute concentration}$$

Q: Which of the following best describes the sodium-potassium pump?

It uses ATP to move Na\textsuperscript{+} out of the cell and K\textsuperscript{+} into the cell against their concentration gradients.

Question 1

Which of the following molecules is most likely to cross a cell membrane by simple diffusion?

Accepted Answer

O	extsubscript{2}

Question 2

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

Accepted Answer

It will swell and may burst as water enters the cell.

Question 3

Which equation best describes the direction of water movement during osmosis?

Accepted Answer

$$	ext{Water moves from an area of lower solute concentration to higher solute concentration}$$

Question 4

Which of the following best explains why ions such as Na	extsuperscript{+} and K	extsuperscript{+} require transport proteins to cross the plasma membrane?

Accepted Answer

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

Question 5

Which process requires energy input from the cell to move molecules against their concentration gradient?

Accepted Answer

Active transport

Question 6

A plant cell is placed in a hypertonic solution. What is the most likely outcome?

Accepted Answer

The cell will become flaccid as water leaves.

Question 7

Which of the following is a function of tight junctions in animal cells?

Accepted Answer

Form a seal to prevent leakage of extracellular fluid

Question 8

What is the main advantage of second messengers in cell signaling?

Accepted Answer

They allow signal amplification for a fast response.

Question 9

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a transport protein

Question 10

Which of the following is NOT a component of the extracellular matrix (ECM)?

Accepted Answer

Phospholipids

Question 11

A cell secretes insulin by packaging it into vesicles and releasing it outside the cell. What process is this?

Accepted Answer

Exocytosis

Question 12

Which of the following best describes the sodium-potassium pump?

Accepted Answer

It uses ATP to move Na	extsuperscript{+} out of the cell and K	extsuperscript{+} into the cell against their concentration gradients.

Question 13

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water across a semipermeable membrane from low to high solute concentration.

Question 14

Which type of cell junction allows direct cytoplasmic exchange of ions and small molecules between adjacent animal cells?

Accepted Answer

Gap junctions

Question 15

Which of the following is true about the permeability of the plasma membrane?

Accepted Answer

It allows some substances to cross more easily than others.

Question 16

A cell is placed in a solution with a higher concentration of nonpenetrating solutes than inside the cell. What type of solution is this?

Accepted Answer

Hypertonic

Question 17

Which of the following best describes the role of fibronectin in the extracellular matrix?

Accepted Answer

It connects the ECM to the cytoskeleton via integrins.

Question 18

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

Accepted Answer

Sodium ions being pumped out of nerve cells by the sodium-potassium pump

Question 19

Which of the following statements about tonicity is correct?

Accepted Answer

Tonicity describes the ability of a solution to cause a cell to gain or lose water.

Question 20

Which of the following best describes the function of desmosomes?

Accepted Answer

They anchor cells together, providing mechanical strength.

Membrane Transport, Osmosis, Tonicity, and Cell Communication

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