Q: Which equation correctly represents the movement of water during osmosis across a selectively permeable membrane?

$$\text{Water moves from an area of low solute concentration to an area of high solute concentration}$$

Question 1

Which of the following best describes the difference between passive and active transport across a cell membrane?

Accepted Answer

Passive transport moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using energy, usually from ATP hydrolysis.

Question 2

A red blood cell is placed in a hypotonic solution. What is the most likely outcome for the cell?

Accepted Answer

The cell will swell and may lyse as water enters the cell.

Question 3

Which equation correctly represents the movement of water during osmosis across a selectively permeable membrane?

Accepted Answer

$$	ext{Water moves from an area of low solute concentration to an area of high solute concentration}$$

Question 4

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion uses transport proteins to move molecules down their concentration gradient without energy input.

Question 5

Which of the following is an example of bulk transport across the plasma membrane?

Accepted Answer

Endocytosis

Question 6

A plant cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

The cell will undergo plasmolysis as water leaves.

Question 7

Which process is responsible for the uptake of cholesterol into cells via LDL particles?

Accepted Answer

Receptor-mediated endocytosis

Question 8

Which of the following statements about the plasma membrane is TRUE?

Accepted Answer

It is selectively permeable, allowing only certain molecules to cross.

Question 9

Which of the following transport mechanisms requires energy input from ATP hydrolysis?

Accepted Answer

Active transport

Question 10

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

Accepted Answer

Neurotransmitters are packaged in vesicles that fuse with the plasma membrane, releasing their contents outside the cell.

Question 11

Which formula best describes the rate of simple diffusion across a membrane?

Accepted Answer

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

Question 12

Which of the following is NOT a function of transport proteins in the plasma membrane?

Accepted Answer

Allowing bulk transport of large molecules via vesicles

Question 13

A patient with hypercholesterolemia has defective LDL receptors. What cellular process is impaired?

Accepted Answer

Receptor-mediated endocytosis

Question 14

Which of the following best describes pinocytosis?

Accepted Answer

The cell takes in extracellular fluid and dissolved solutes via small vesicles.

Question 15

Which scenario would require active transport rather than passive transport?

Accepted Answer

Movement of glucose into a cell against its concentration gradient

Question 16

Which of the following is TRUE about facilitated diffusion?

Accepted Answer

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

Question 17

Which of the following best explains why ions cannot easily cross the lipid bilayer by simple diffusion?

Accepted Answer

Ions are charged and the hydrophobic core of the bilayer prevents their passage.

Question 18

Which process is most directly responsible for the uptake of large particles such as bacteria by immune cells?

Accepted Answer

Phagocytosis

Question 19

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

Accepted Answer

It will remain the same size as water movement is balanced.

Question 20

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the passive diffusion of free water down its concentration gradient.

Lecture 6 slides

Guida di studio - Domande di pratica

Study guide - Flashcard