Module 2 Chapter 5 Lesson 3 - Diffusion

Question 1

What is the definition of diffusion?

Answer 1

The net movement of particles/ions from a high concentration to a low concentration.

Question 2

Is diffusion an active or passive process?

Answer 2

Passive

Question 3

Why does diffusion happen?

Answer 3

Particles of gas are randomly moving due to having kinetic energy.
Eventually distribution of particles will become an equal distribution.
Until equilibrium is reached

Question 4

What are the factors affecting the rate of diffusion?

Answer 4

Temperature
Concentration difference
Surface Area
Thickness of membrane
Increased blood supply

Question 5

How does temperature increase diffusion?

Answer 5

Increases kinetic energy
Increases speeds

Question 6

How does a concentration difference increase diffusion?

Answer 6

Greater difference = faster diffusion due to concentration gradient.

Question 7

How does the surface area of the membrane increase diffusion?

Answer 7

Increased surface area = Increased area of exchange surface = Faster diffusion.

Question 8

How does the thickness of the membrane increase diffusion?

Answer 8

Thinner exchange surface area = Increased rate of diffusion

Question 9

How do particles pass through the phospholipid bilayer?

Answer 9

It is permeable.

Question 10

What type of gaseous molecules move across membranes?

Answer 10

Polar

Question 11

Are membranes semi permeable or partially permeable?

Answer 11

Partially Membrane.

Question 12

What type of substances can enter the plasma membrane?

Answer 12

Lipid soluble and small molecules

Question 13

Is facilitated diffusion active or passive?

Answer 13

Passive

Question 14

Give three examples of substances that can pass through the plasma membrane?

Answer 14

Oxygen
Nicotine
Caffeine

Question 15

How do large/polar molecules pass through the cell?

Answer 15

With aid of a carrier protein through a protein channel.

Question 16

What are the carrier proteins specific to?

Answer 16

The molecule they carry.

Question 17

What does facilitated diffusion rely on?

Answer 17

Kinetic energy of the atom/molecule already has.

Question 18

What type of molecules can pass through a protein channel?

Answer 18

Ions and small molecules.

Question 19

What do protein channels act as?

Answer 19

A pore in the membrane

Question 20

What is a feature of a protein channel that can change the flow?

Answer 20

Can open and close

Question 21

What type of molecules can carrier proteins transport?

Answer 21

Larger molecules can be transported.

Question 22

How do carrier proteins carry molecules?

Answer 22

Molecules attach to the protein and it changes shape to transfer the molecules across the membrane using kinetic energy from the molecule.