Question 1

Which structure is unique to plant cells and provides rigidity and protection against osmotic stress?

Accepted Answer

Cell wall

Question 2

What is the primary function of plasmodesmata in plant cells?

Accepted Answer

Allow direct cytoplasmic exchange between adjacent cells

Question 3

Which component of the animal cell extracellular matrix is primarily responsible for tensile strength?

Accepted Answer

Collagen fibers

Question 4

According to the fluid mosaic model, which statement best describes the structure of the plasma membrane?

Accepted Answer

A dynamic bilayer of phospholipids with proteins and carbohydrates floating within it

Question 5

Which equation correctly represents the calculation of water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 6

A researcher observes that animal cells placed in a hypertonic solution shrink. Which process is responsible for this observation?

Accepted Answer

Osmosis of water out of the cell

Question 7

Which cell junction in animal cells prevents the passage of molecules between adjacent cells, maintaining distinct tissue compartments?

Accepted Answer

Tight junctions

Question 8

If a plant cell is placed in pure water, which of the following will occur?

Accepted Answer

The cell will gain water and become turgid

Question 9

Which molecule is most likely to pass through the plasma membrane by simple diffusion?

Accepted Answer

Oxygen ($$O_2)$$

Question 10

Which of the following best describes the role of integrins in animal cells?

Accepted Answer

They connect the extracellular matrix to the cytoskeleton

Question 11

A mutation disrupts the formation of desmosomes in epithelial tissue. What is the most likely consequence?

Accepted Answer

Cells will detach easily under mechanical stress

Question 12

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

Accepted Answer

Active transport

Question 13

Which of the following is a key difference between the plant cell wall and the animal cell extracellular matrix?

Accepted Answer

The plant cell wall is primarily composed of cellulose, while the animal ECM is rich in collagen and proteoglycans

Question 14

Which equation best describes the net movement of water across a semipermeable membrane?

Accepted Answer

$$J = L_p (\Delta P - \Delta \pi)$$

Question 15

A cell receives a signal from its environment and responds by activating a metabolic pathway. Which process describes this phenomenon?

Accepted Answer

Signal transduction

Question 16

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

Accepted Answer

Animal cells lack a cell wall and can lyse in hypotonic solutions

Question 17

Which structure allows animal cells to communicate directly by passing ions and small molecules between adjacent cells?

Accepted Answer

Gap junctions

Question 18

A scientist wants to increase the fluidity of a cell membrane at low temperatures. Which modification would be most effective?

Accepted Answer

Increase the proportion of unsaturated fatty acids in phospholipids

Question 19

Which of the following is NOT a function of the extracellular matrix in animal cells?

Accepted Answer

Synthesizing ATP

Question 20

A plant cell is exposed to a solution with a water potential ($$\Psi) of$$ $$-0.5$$ MPa. If the cell's internal water potential is $$-0.3$$ MPa, what will happen?

Accepted Answer

Water will move out of the cell

Membranes, Metabolism, and Cellular Communication: Structure and Function in Plant and Animal Cells

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