Q: Which equation correctly represents the net movement of water during osmosis?

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

Question 1

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

Accepted Answer

Movement of molecules down their concentration gradient without energy investment.

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 possibly burst as water enters the cell.

Question 3

Which equation correctly represents the net movement of water during osmosis?

Accepted Answer

$$	ext{Water moves from an area of higher } \Psi_s 	ext{ to lower } \Psi_s$$

Question 4

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion uses membrane proteins to transport substances down their concentration gradient.

Question 5

Which of the following is an example of active transport?

Accepted Answer

Glucose entering a cell via a sodium-glucose cotransporter using ATP.

Question 6

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

Accepted Answer

The cell will undergo plasmolysis as water leaves.

Question 7

Which statement about aquaporins is correct?

Accepted Answer

Aquaporins facilitate the passive movement of water molecules.

Question 8

If a cell is placed in an isotonic solution, what will happen to the net movement of water?

Accepted Answer

There will be no net movement of water.

Question 9

Which of the following best explains why ions cannot easily cross the lipid bilayer by simple diffusion?

Accepted Answer

Ions are hydrophilic and the bilayer interior is hydrophobic.

Question 10

A scientist observes that glucose uptake in guinea pig red blood cells increases with age. Which of the following is a plausible explanation based on membrane transport concepts?

Accepted Answer

Older cells have more glucose transport proteins facilitating diffusion.

Question 11

Which of the following is true regarding the sodium-potassium pump?

Accepted Answer

It requires ATP to function.

Question 12

Which scenario best illustrates the concept of dynamic equilibrium in diffusion?

Accepted Answer

Molecules continue to move randomly, but there is no net movement across the membrane.

Question 13

Which of the following best describes the effect of a cell wall on water balance in plant cells?

Accepted Answer

The cell wall allows the cell to become turgid without bursting.

Question 14

Which of the following is NOT a characteristic of facilitated diffusion?

Accepted Answer

It requires energy from ATP.

Question 15

A cell is placed in a solution with a higher solute concentration than its cytoplasm. What type of solution is this, and what will happen to the cell?

Accepted Answer

Hypertonic; the cell will lose water and shrink.

Question 16

Which of the following best explains why glucose cannot cross the cell membrane by simple diffusion?

Accepted Answer

Glucose is polar and requires a transport protein.

Question 17

Which of the following is a real-life example of osmosis?

Accepted Answer

A wilted plant becoming turgid after being watered.

Question 18

Which of the following statements about channel proteins is correct?

Accepted Answer

Channel proteins provide a hydrophilic pathway for specific molecules or ions.

Question 19

Which process is responsible for the movement of carbon dioxide out of cells into the bloodstream?

Accepted Answer

Simple diffusion

Question 20

Which of the following best describes the energy requirement for active transport?

Accepted Answer

Active transport requires energy, usually from ATP, to move substances against their concentration gradients.

Membrane Transport: Passive and Active Mechanisms

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