Question 1

Which of the following best describes the function of tight junctions in epithelial cells?

Accepted Answer

They fuse adjacent cells to form an impermeable barrier that encircles the whole cell.

Question 2

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

Accepted Answer

Synthesis of phospholipids

Question 3

A cell placed in a hypertonic solution will:

Accepted Answer

Shrink as water leaves the cell

Question 4

Which equation correctly represents the relationship between osmotic pressure ($\Pi$), solute concentration ($C$), gas constant ($R$), and temperature ($T$)?

Accepted Answer

$\Pi = CRT$

Question 5

Which of the following best explains why facilitated diffusion does not require energy?

Accepted Answer

It uses carrier proteins to move molecules down their concentration gradient.

Question 6

Which type of membrane transport is responsible for the movement of water and solutes from a region of higher pressure to a region of lower pressure?

Accepted Answer

Filtration

Question 7

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

Accepted Answer

Cells will burst due to water entering.

Question 8

Which of the following is a correct description of desmosomes?

Accepted Answer

They link proteins of neighboring cells like the teeth of a zipper, providing resistance to tension.

Question 9

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

It increases membrane fluidity and stability.

Question 10

Which of the following is TRUE about active transport?

Accepted Answer

It requires energy in the form of ATP.

Question 11

Which of the following is an example of a peripheral membrane protein function?

Accepted Answer

Providing enzymes for shape change during cell division

Question 12

Which of the following best describes the structure of a phospholipid in the plasma membrane?

Accepted Answer

A hydrophilic head and two hydrophobic tails

Question 13

Which process is responsible for the movement of oxygen from the alveoli into the blood in the lungs?

Accepted Answer

Simple diffusion

Question 14

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

Accepted Answer

Synthesizing proteins for the cell

Question 15

Which equation best represents the rate of diffusion ($J$) across a membrane according to Fick's Law?

Accepted Answer

$J = -D \dfrac{\Delta C}{\Delta x}$

Question 16

Which of the following statements about gap junctions is correct?

Accepted Answer

They allow electrical signals and small molecules to pass quickly from one cell to the next.

Question 17

Which of the following is a correct example of a receptor for signal transduction in the plasma membrane?

Accepted Answer

A protein that binds a hormone and initiates a cellular response

Question 18

Which of the following is TRUE regarding facilitated diffusion?

Accepted Answer

It moves hydrophilic molecules through carrier proteins or channels.

Question 19

Which of the following extracellular materials is most important for resisting compression in connective tissues?

Accepted Answer

Proteoglycans

Question 20

A cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

It will remain unchanged.

Cell Structure and Membrane unit 2

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