transport across cell membranes

Question 1

What is the primary function of the cell membrane?

Answer 1

To regulate the movement of substances in and out of the cell.

Question 2

True or False: The cell membrane is selectively permeable.

Answer 2

True

Question 3

What are the main components of the cell membrane?

Answer 3

Phospholipids, proteins, cholesterol, and carbohydrates.

Question 4

Fill in the blank: The fluid mosaic model describes the structure of the __________.

Answer 4

cell membrane

Question 5

What type of transport does not require energy?

Answer 5

Passive transport

Question 6

Multiple Choice: Which of the following processes is an example of active transport? A) Diffusion B) Osmosis C) Sodium-potassium pump D) Facilitated diffusion

Answer 6

C) Sodium-potassium pump

Question 7

What is osmosis?

Answer 7

The diffusion of water across a selectively permeable membrane.

Question 8

True or False: Facilitated diffusion requires energy.

Answer 8

False

Question 9

What is the role of channel proteins in the cell membrane?

Answer 9

To facilitate the passage of specific ions and molecules.

Question 10

Fill in the blank: __________ is the process by which large molecules enter the cell through vesicles.

Answer 10

Endocytosis

Question 11

Multiple Choice: Which term describes the movement of water from a region of low solute concentration to high solute concentration? A) Active transport B) Osmosis C) Diffusion D) Filtration

Answer 11

B) Osmosis

Question 12

What is the function of cholesterol in the cell membrane?

Answer 12

To maintain membrane fluidity and stability.

Question 13

True or False: Ion channels are specific for certain ions.

Answer 13

True

Question 14

What is the difference between passive and active transport?

Answer 14

Passive transport does not require energy, while active transport does.

Question 15

Fill in the blank: The process by which cells expel materials is called __________.

Answer 15

Exocytosis