Q: Which equation correctly relates osmolarity to molarity for a solution of NaCl?

$$Osmolarity = Molarity \times \text{number of particles}$$

Question 1

Which of the following statements best describes the principle of complementarity of structure and function in cells?

Accepted Answer

The biochemical functions of cells are dictated by the shape of the cell and specific subcellular structures.

Question 2

A patient receives an intravenous solution that is hypotonic compared to their red blood cells. What is the most likely outcome for the red blood cells?

Accepted Answer

The cells will swell and may burst due to water entering the cell.

Question 3

Which component of the plasma membrane is primarily responsible for its fluid mosaic nature?

Accepted Answer

Phospholipids

Question 4

A cell is placed in a solution with a higher osmolarity than its cytoplasm. What process will occur, and what is the result?

Accepted Answer

Osmosis will cause water to leave the cell, resulting in shrinking (crenation).

Question 5

Which type of membrane protein is most likely to function as a receptor for signal transduction?

Accepted Answer

Integral protein

Question 6

What is the main function of desmosomes in tissues such as skin and heart muscle?

Accepted Answer

To anchor cells together and provide resistance to mechanical stress.

Question 7

Which equation correctly relates osmolarity to molarity for a solution of NaCl?

Accepted Answer

$$Osmolarity = Molarity 	imes 	ext{number of particles}$$

Question 8

Which of the following best explains why oxygen and carbon dioxide can easily cross the plasma membrane?

Accepted Answer

They are nonpolar and lipid-soluble, allowing simple diffusion through the phospholipid bilayer.

Question 9

A cell is exposed to a toxin that destroys its plasma membrane. Which of the following is a likely consequence?

Accepted Answer

Substances will diffuse freely into and out of the cell, disrupting concentration gradients.

Question 10

Which of the following is NOT a function performed by membrane proteins?

Accepted Answer

Storing genetic information

Question 11

Which type of cell junction allows the rapid passage of ions and electrical signals between cardiac muscle cells?

Accepted Answer

Gap junctions

Question 12

If a cell is placed in an isotonic solution, what will happen to its internal water volume?

Accepted Answer

It will remain unchanged.

Question 13

Which of the following best describes facilitated diffusion?

Accepted Answer

Passive transport of polar molecules via carrier or channel proteins down their concentration gradient.

Question 14

Which pressure is responsible for the tendency of water to enter a cell with higher solute concentration?

Accepted Answer

Osmotic pressure

Question 15

Which of the following is a correct statement about the glycocalyx?

Accepted Answer

It consists of sugars attached to lipids and proteins on the cell surface, serving as biological markers for cell recognition.

Question 16

A red blood cell is placed in a 2 Osm NaCl solution. What is the molarity of NaCl in this solution?

Accepted Answer

$$1\,M$$

Question 17

Which of the following factors does NOT increase the rate of diffusion across the plasma membrane?

Accepted Answer

Lowering the temperature

Question 18

Which type of membrane protein is most likely to be involved in temporary cell-to-cell joining during immune cell migration?

Accepted Answer

Cell adhesion molecules (CAMs)

Question 19

Which of the following best explains why plant cells do not burst when placed in hypotonic solutions, unlike animal cells?

Accepted Answer

Plant cells have strong cell walls that limit hydrostatic pressure.

Question 20

Which of the following is a real-life consequence of a rapidly changing glycocalyx in cancer cells?

Accepted Answer

The immune system fails to recognize and destroy the cancer cell, allowing it to replicate.

Cells: The Living Units – Structure, Diversity, and Function

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