Name ____Key_______________ Test Date _______________________ Block ___________
Unit 3 Study Guide – Cell Transport
1. Cell Transport Vocabulary
Vocab Term
Passive Transport
Definition
Analogy/Diagram
Analogy:
Sledding down a hill
Requires no energy (ATP)
Particles go from a high to low concentration
Example:
Diffusion
Passive transport of particles across the cell membrane
CO2 O2
Diagram:
Diffusion of water across the cell membrane
Osmosis
Active Transport
Requires ATP
Particles go from low to high concentration
Analogy:
Pulling a sled up a hill
Diagram:
Endocytosis
The active transport of particles into the cell.
“entering”
Diagram:
Exocytosis
The active transport of particles out of the cell.
“exiting”
Example:
The amount of substance (solute) in a solution
Concentration
How much myo you put in
your water bottle
Analogy:
Barrier that allows only certain particles to pass though it
Semi-permeable
membrane
Security gate
2. Why are both osmosis and diffusion types of passive transport? Explain your answer. _______They do not
require any ATP because they are smaller molecules moving from a high concentration to a low
concentration.__________________
3. Does the following diagram show osmosis or diffusion? Why?
Osmosis because it is the movement of water molecules.
_________________________________________________
__________________________________________________
__________________________________________________
4. Draw arrows in the diagram below indicating which direction
the molecules will travel across the cell membrane to eventually reach equilibrium. What will happen to the size
of the cell?
KCl
H2O
KCl
KCl
H2O
H2O
H2O
H2O
KCl
H2O
KCl
KCl
KCl
H2O
H2O
H2O
5. Describe the make-up of the cell membrane and state the three criteria that it uses to transport materials across
the membrane.
____The cell membrane is made of a bilipid layer(fats) with pores or channels in it to allow certain chemicals to
pass through. The three criteria used by the membrane are size of the particle, size of the pore and chemical
composition of the particle.______________________
6. What are the similarities and differences of active and passive transport?
_______Both processes allow substances to enter and exit the cell. Active transport requires energy and moves
particles from a low to high concentration. This type of transport moves large particles such as sugar and amino
acids (proteins). Passive transport does not require energy and moves particles from an area of high to low
concentration. This type of transport moves smaller molecules such as gases and sodium. Osmosis is a type of
passive transport that moves water.