Download Lesson 5.2 Notesheet

Name: ________________________________________ Period: _____
LESSON 5.2: Cell Transport & Homeostasis: Cell Transport-Passive and Active
Transport Across Membranes
1. Which gases can easily cross the plasma membrane? _____ and _____
2. What type of molecules cannot easily cross?
________________________________________________________________________
________________________________________________________________________
3. What are the three main ways that molecules can pass through a plasma membrane?
a. ____________________________________ Needs energy input (YES/ NO)
b. ____________________________________ Needs energy input (YES/ NO)
c. ____________________________________ Needs energy input (YES/ NO)
PASSIVE TRANSPORT
1. Moving from an area of _________ to __________ concentration.
2. What is meant by concentration?
________________________________________________________________________
3. Three types of passive transport:
a. ___________________________________
b. ___________________________________
c. ___________________________________
Diffusion, also known as Simple Diffusion
1. Why do molecules diffuse?
________________________________________________________________________
2. Concentration gradient __________________________________________________
Up or down the gradient? ______________
3. Draw arrows on the diagram below to show which way the molecules are moving.
4. Is the higher concentration inside or outside of the cell originally?__________________
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5. When does diffusion stop? _________________________________________________
Osmosis
1. Osmosis is the diffusion of what type of molecule? ___________________
2. Moving from an area of _________ to __________ concentration.
Up or down the gradient? ______________
3. When does osmosis stop? _________________________________________________
4. Define the following terms:
Solute: ________________________________________________________________
Solvent: _______________________________________________________________
Solution: ______________________________________________________________
4. Solution with higher solute concentration is (hypertonic or hypotonic). CIRCLE ONE
5. Solution with lower solute concentration is (hypertonic or hypotonic). CIRCLE ONE
6. What does isotonic mean?
________________________________________________________________________
7. Label each image below as being hypotonic, hypertonic, or isotonic solution outside the
cell. (There is one of each type).
a. ________________
b. ________________
c. ________________
Osmotic Pressure
1. Explain how osmotic pressure is beneficial to plant cells.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2. What type of organisms can osmotic pressure be harmful to? WHY????
________________________________________________________________________
________________________________________________________________________
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Controlling Osmosis
1. How do organisms that live in hypotonic environments control their cellular water
intake? _________________________________________________________________
Facilitated Diffusion
1. How do molecules pass through the membrane during facilitated diffusion?
________________________________________________________________________
2. Why is facilitated diffusion still considered passive transport?
________________________________________________________________________
3. What type of molecules pass through using facilitated diffusion?
________________________________________________________________________
4. Four types of membrane proteins involved in facilitated diffusion:
a. ______________________________________
b. ______________________________________
c. ______________________________________
d. ______________________________________
ACTIVE TRANSPORT
1. Does this type of transport require the input of energy? __________
2. Moving from an area of _________ to __________ concentration.
3. Up or down the gradient? ______________
4. What molecule provides the energy for active transport? __________
5. How are small molecules moved across the membrane through active transport?
________________________________________________________________________
6. How are large molecules moved across the membrane through active transport?
________________________________________________________________________
Sodium-Potassium Pump
1. What type of membrane protein is used? ______________________________
2. Is this type of active transport found in plant cells, animal cells, or both plant and animal
cells? ________________________________
3. Explain how the sodium-potassium pump works.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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Electrochemical Gradient
1. How is an electrochemical gradient created?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2. The voltage across a membrane is called ______________________________________.
3. What two forces drive the diffusion of ions across the plasma membrane?
a. ____________________________________________________________________
b. ____________________________________________________________________
Vesicle Transport
1. What type of molecules use this mode of transport? _____________________________
2. Two types of vesicle transport:
a.
__________________________
b.
__________________________
3. Look at the picture below and label which side shows endocytosis and which side shows
exocytosis.
a. _________________________
b. _________________________
4. Two main types of endocytosis:
a. _________________________ or ___________________________________
b. _________________________ or ___________________________________
5. Look at the picture below and label the two main types of endocytosis.
a. ___________________
b. ___________________
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