Diffusion

Question 1

What is diffusion?

Answer 1

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.

Question 2

True or False: Diffusion requires energy input.

Answer 2

False

Question 3

Fill in the blank: Diffusion is a ______ process.

Answer 3

Passive

Question 4

What factors affect the rate of diffusion?

Answer 4

Temperature, concentration gradient, surface area, and molecular size.

Question 5

Which type of molecules diffuse more quickly: small or large molecules?

Answer 5

Small molecules

Question 6

What role does the cell membrane play in diffusion?

Answer 6

The cell membrane selectively allows certain molecules to pass through via diffusion.

Question 7

What is osmosis?

Answer 7

Osmosis is the diffusion of water across a selectively permeable membrane.

Question 8

Fill in the blank: In osmosis, water moves from an area of ______ water concentration to an area of ______ water concentration.

Answer 8

low, high

Question 9

What is facilitated diffusion?

Answer 9

Facilitated diffusion is the process where molecules are transported across the cell membrane with the help of transport proteins.

Question 10

True or False: Facilitated diffusion requires energy.

Answer 10

False

Question 11

What is the difference between simple diffusion and facilitated diffusion?

Answer 11

Simple diffusion does not require transport proteins, while facilitated diffusion does.

Question 12

What is active transport?

Answer 12

Active transport is the movement of molecules from an area of low concentration to an area of high concentration using energy.

Question 13

Fill in the blank: Active transport requires the use of ______.

Answer 13

Energy (ATP)

Question 14

What is the importance of diffusion in cells?

Answer 14

Diffusion is essential for the transport of nutrients, waste removal, and maintaining cellular homeostasis.

Question 15

How does temperature affect the rate of diffusion?

Answer 15

Higher temperatures increase the rate of diffusion as molecules have more kinetic energy.

Question 16

What is the significance of the concentration gradient in diffusion?

Answer 16

The greater the concentration gradient, the faster the rate of diffusion.

Question 17

What is the role of ion channels in diffusion?

Answer 17

Ion channels allow specific ions to pass through the cell membrane via diffusion.

Question 18

What is the driving force behind diffusion?

Answer 18

The driving force behind diffusion is the random movement of molecules.

Question 19

True or False: Diffusion is a passive process.

Answer 19

True

Question 20

What is the main difference between diffusion and active transport?

Answer 20

Diffusion does not require energy input, while active transport does.

Question 21

How does the size of molecules impact diffusion?

Answer 21

Smaller molecules diffuse more rapidly than larger molecules.

Question 22

What is the significance of surface area in diffusion?

Answer 22

A larger surface area allows for more efficient diffusion.

Question 23

How does molecular weight affect the rate of diffusion?

Answer 23

Lighter molecules diffuse faster than heavier molecules.

Question 24

What is the role of carrier proteins in facilitated diffusion?

Answer 24

Carrier proteins assist in the transport of molecules across the cell membrane during facilitated diffusion.

Question 25

What is the importance of diffusion in gas exchange in the lungs?

Answer 25

Diffusion allows for the exchange of oxygen and carbon dioxide between the alveoli and capillaries in the lungs.

Question 26

What is the significance of diffusion in plant roots?

Answer 26

Diffusion helps in the uptake of water and minerals from the soil by plant roots.

Question 27

How does the lipid bilayer of the cell membrane impact diffusion?

Answer 27

The lipid bilayer provides a barrier that certain molecules can diffuse through.

Question 28

What is the role of aquaporins in osmosis?

Answer 28

Aquaporins are water channel proteins that facilitate the movement of water during osmosis.