Q: Which equation correctly represents the calculation of molarity ($M$) in a solution?

$M = \frac{\text{moles of solute}}{\text{volume of solution (L)}}$

Question 1

Which process is primarily responsible for the movement of water across a cell membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 2

A scientist observes that glucose molecules move into a cell against their concentration gradient. Which cellular process is most likely responsible for this movement?

Accepted Answer

Active transport

Question 3

Which of the following best describes the role of receptor proteins in the cell membrane?

Accepted Answer

They bind specific molecules and transmit signals into the cell.

Question 4

A cell is placed in a solution and begins to swell. What type of solution is the cell most likely in?

Accepted Answer

Hypotonic

Question 5

Which equation correctly represents the calculation of molarity ($M$) in a solution?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}}$

Question 6

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

Accepted Answer

Sodium-potassium pump maintaining nerve cell potential

Question 7

Which statement best explains why enzymes are necessary for many cellular reactions?

Accepted Answer

Enzymes decrease the activation energy, speeding up reactions.

Question 8

A student mixes 0.5 moles of NaCl in 1 liter of water. What is the molarity of the solution?

Accepted Answer

$0.5\ 	ext{M}$

Question 9

Which process involves the cell membrane engulfing large particles or liquids to bring them into the cell?

Accepted Answer

Endocytosis

Question 10

Which of the following best describes the function of phospholipids in the cell membrane?

Accepted Answer

They form a semi-permeable barrier between the cell and its environment.

Question 11

A patient is given an intravenous solution that is hypertonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

Cells will shrink due to water loss.

Question 12

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Synthesizing DNA for cell division

Question 13

Which process requires energy input from the cell in the form of ATP?

Accepted Answer

Active transport

Question 14

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a protein channel

Question 15

A cell uses exocytosis to release neurotransmitters into the synaptic cleft. Which statement best describes this process?

Accepted Answer

Vesicles fuse with the cell membrane to expel substances outside.

Question 16

Which of the following is a consequence of a cell losing its ability to regulate osmosis?

Accepted Answer

The cell may swell and burst or shrink and shrivel.

Question 17

Which formula would you use to calculate the number of moles ($n$) in a solution if you know the molarity ($M$) and the volume ($V$) in liters?

Accepted Answer

$n = M 	imes V$

Question 18

Which of the following molecules is most likely to pass directly through the phospholipid bilayer without assistance?

Accepted Answer

Small nonpolar molecules

Question 19

A cell is observed to have a high concentration of sodium ions outside and a low concentration inside. Which mechanism maintains this gradient?

Accepted Answer

Sodium-potassium pump (active transport)

Question 20

Which of the following best explains why cells must maintain a balance of water and solutes?

Accepted Answer

To prevent cell lysis or shrinkage due to osmotic pressure

Cell Membrane Structure and Transport Mechanisms

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