Question 1

Which of the following best describes the main difference between simple diffusion and facilitated diffusion across the plasma membrane?

Accepted Answer

Facilitated diffusion requires membrane proteins to transport substances, while simple diffusion does not.

Question 2

A cell is placed in a solution and begins to swell. Which type of solution is the cell in, and what is the direction of water movement?

Accepted Answer

The cell is in a hypotonic solution; water moves into the cell.

Question 3

Which of the following equations correctly represents the calculation of osmotic pressure ($$\Pi) $$using van't Hoff's law?

Accepted Answer

$$\Pi = iMRT$$

Question 4

Which of the following best describes the function of the sodium-potassium pump ($$\mathrm{Na^+/K^+}-$$ATPase) in the plasma membrane?

Accepted Answer

It pumps three sodium ions out of the cell and two potassium ions into the cell using ATP.

Question 5

A white blood cell engulfs a bacterium by wrapping its plasma membrane around it and forming a vesicle. Which process is being described?

Accepted Answer

Phagocytosis

Question 6

Which of the following statements about exocytosis is correct?

Accepted Answer

Exocytosis requires the fusion of vesicles with the plasma membrane to release substances outside the cell.

Question 7

Which organelle is primarily responsible for the synthesis of proteins that are exported from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 8

A patient is diagnosed with a genetic disorder that affects the function of lysosomes. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Intracellular digestion of macromolecules

Question 9

Which of the following best describes the structure of the plasma membrane according to the fluid mosaic model?

Accepted Answer

A double layer of phospholipids with proteins embedded and able to move laterally

Question 10

Which type of cell junction allows ions and small molecules to pass directly from one cell to another, facilitating rapid communication in cardiac muscle?

Accepted Answer

Gap junction

Question 11

Which of the following is a key difference between endocytosis and exocytosis?

Accepted Answer

Endocytosis involves vesicle formation from the plasma membrane, while exocytosis involves vesicle fusion with the plasma membrane.

Question 12

Which of the following best describes the main function of desmosomes in epithelial tissue?

Accepted Answer

They anchor adjacent cells together to provide mechanical strength.

Question 13

A laboratory experiment measures the rate of glucose transport into cells. When a competitive inhibitor is added, the rate of transport decreases. Which type of membrane transport is most likely being observed?

Accepted Answer

Facilitated diffusion

Question 14

Which of the following tissue types is specialized for rapid communication and control of body functions?

Accepted Answer

Nervous tissue

Question 15

Which of the following best describes the difference between stratified and simple epithelial tissue?

Accepted Answer

Stratified epithelium consists of multiple layers of cells, providing protection, while simple epithelium consists of a single layer, allowing absorption and filtration.

Question 16

A patient is suffering from dehydration. Which direction will water move across the plasma membrane of their red blood cells if they are given a hypertonic intravenous solution?

Accepted Answer

Water will move out of the red blood cells, causing them to shrink.

Question 17

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion

Question 18

Which of the following best explains why active transport is necessary for certain substances to cross the plasma membrane?

Accepted Answer

Active transport moves substances against their concentration gradient using energy from ATP.

Question 19

Which of the following equations correctly represents Fick's law of diffusion for the rate of diffusion ($$J) $$across a membrane?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 20

Which of the following best describes the role of tight junctions in epithelial tissue?

Accepted Answer

They prevent the movement of substances between adjacent cells, creating a barrier.

Cell Membranes, Transport, and Epithelial Tissue: Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard