Section 3 Lesson 3
What is Diffusion? Study Questions
Learning Objectives
• Describe the different membrane transport mechanisms and how they
work.
• Describe homeostasis.
1. How does the cell membrane support homeostasis in the cell?
The cell membrane supports homeostasis by controlling what enters and
leaves the cell.
2. What characteristics of a molecule determine its ability to pass through a
membrane?
A molecule’s size, polarity, and charge determine if it can pass through the
membrane.
3. Simple Diffusion
3.1 Is this process passive or active?
Passive
3.2 Is a transport protein required?
No transport protein needed
3.3 What types of molecules can pass through the membrane by simple
diffusion?
Small, nonpolar molecules
3.4 Do the molecules move from low to high concentration or high to low
concentration?
Moves from high to low concentration
4. Facilitated Diffusion
4.1 Is this process passive or active?
Passive
1 | Section 3 Lesson 3
What is Diffusion? Study Questions
Learning Objectives
• Describe the different membrane transport mechanisms and how they
work.
• Describe homeostasis.
1. How does the cell membrane support homeostasis in the cell?
The cell membrane supports homeostasis by controlling what enters and
leaves the cell.
2. What characteristics of a molecule determine its ability to pass through a
membrane?
A molecule’s size, polarity, and charge determine if it can pass through the
membrane.
3. Simple Diffusion
3.1 Is this process passive or active?
Passive
3.2 Is a transport protein required?
No transport protein needed
3.3 What types of molecules can pass through the membrane by simple
diffusion?
Small, nonpolar molecules
3.4 Do the molecules move from low to high concentration or high to low
concentration?
Moves from high to low concentration
4. Facilitated Diffusion
4.1 Is this process passive or active?
Passive
1 | Section 3 Lesson 3
