Q: Which equation correctly represents the relationship between solute concentration and water concentration during osmosis?

$$[\text{solute}] \uparrow \implies [\text{water}] \downarrow$$

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

Water moves from high $$[\text{water}] to $$low $$[\text{water}]$$

Question 1

Which of the following best describes the role of the cell membrane in maintaining homeostasis?

Accepted Answer

It is selectively permeable, controlling the movement of substances in and out of the cell.

Question 2

A red blood cell is placed in a hypertonic solution. What will happen to the cell, and why?

Accepted Answer

The cell will shrivel because water moves out of the cell.

Question 3

Which of the following is an example of active transport?

Accepted Answer

Pumping sodium ions ($$\mathrm{Na^+}) $$out of a nerve cell using ATP

Question 4

Which equation correctly represents the relationship between solute concentration and water concentration during osmosis?

Accepted Answer

$$[	ext{solute}] \uparrow \implies [	ext{water}] \downarrow$$

Question 5

A patient receives an intravenous (IV) solution that is hypotonic relative to their blood cells. What is the most likely outcome for the cells?

Accepted Answer

Cells will swell and may burst due to water entering.

Question 6

Which process requires a transport protein but does NOT require energy from ATP?

Accepted Answer

Facilitated diffusion

Question 7

During which type of feedback mechanism does the output amplify the original stimulus, and what is a real-life example?

Accepted Answer

Positive feedback; childbirth contractions

Question 8

Which of the following molecules can most easily diffuse through the cell membrane without assistance?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 9

A cell needs to quickly remove waste ions against their concentration gradient. Which transport mechanism will it most likely use?

Accepted Answer

Molecular pumps (active transport)

Question 10

Which of the following best describes the movement of water during osmosis?

Accepted Answer

Water moves from high $$[	ext{water}] to $$low $$[	ext{water}]$$

Question 11

Which scenario is an example of exocytosis?

Accepted Answer

A nerve cell releasing neurotransmitters into a synapse

Question 12

Which of the following statements about passive transport is correct?

Accepted Answer

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

Question 13

If a cell is placed in an isotonic solution, what will happen to the cell's volume?

Accepted Answer

It will remain the same.

Question 14

Which of the following best explains why glucose requires facilitated diffusion to enter most cells?

Accepted Answer

Glucose is a large, polar molecule that cannot easily cross the lipid bilayer.

Question 15

Which of the following is NOT a function of negative feedback in biological systems?

Accepted Answer

Amplifying uterine contractions during childbirth

Question 16

A scientist observes that after adding a certain solute to a solution, the water concentration decreases. Which formula best represents this relationship?

Accepted Answer

$$[	ext{solute}] \uparrow \implies [	ext{water}] \downarrow$$

Question 17

Which of the following best describes the difference between endocytosis and exocytosis?

Accepted Answer

Endocytosis brings materials into the cell, exocytosis exports materials out.

Question 18

Which of the following is an example of a solution, as defined in cell biology?

Accepted Answer

Lemonade made by dissolving powder in water

Question 19

Which process is responsible for the movement of oxygen ($$\mathrm{O_2$}) $$from the lungs into the blood?

Accepted Answer

Simple diffusion

Question 20

A cell is placed in a solution and water moves into the cell, causing it to swell. Which type of solution is the cell in?

Accepted Answer

Hypotonic

Cell Transport and Homeostasis: Mechanisms of Membrane Transport

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