Cell Transport Lesson

Passive Transport

Diffusion

Movement of molecules from high concentration to low concentration.

Stops when equilibrium is reached

Multiple Choice

How do molecules move during diffusion?

• From high concentration to low concentration

• From low concentration to high concentration

Equilibrium

Molecules are equally spread out

Multiple Choice

What is the goal of diffusion called when molecules are equally spread out?

• Samenss

• Equilibrium

Passive Transport

• Movement of substance across plasma membrane WITHOUT any energy

Simple Diffusion

Molecules move from high concentration to low concentration through a membrane

Multiple Choice

Does passive transport require energy?

• Yes

• No

Multiple Choice

True or False: In simple diffusion, molecules move from high concentration to low concentration across a membrane.

• True

• False

Facilitated Diffusion

Does NOT require energy
Transports moleles from high concentrations to low concentrations using a channel protein located inside the cell membrane

Multiple Choice

Which type of diffusion uses a protein to help molecules get across?

• Simple diffusion

• Facilitated diffusion

Multiple Choice

In which osmotic state does the cell shrink?

• hypertonic

• isotonic

• hypotonic

Multiple Choice

In which osmotic state does the cell look normal?

• hypertonic

• isotonic

• hypotonic

Multiple Choice

During which osmotic state does the cell swell and get bigger?

• Hypertonic

• Isotonic

• Hypotonic

Multiple Choice

Which of the following best explains the transport of water into and out of the cell?

• Water moves freely and does not depend on the solute concentrations

• Water movement is dependent of the concentration inside and outside the cell

• Water only transports out of the cell to achieve equilbrium

• Water only transports into the cell to achieve equilibrium

Multiple Choice

How does active transport differ from passive transport?

• Uses energy

• Does NOT use energy

Active Transport

• Use energy (ATP)

• Moves molecules from low concentration to high concentration

  
  

The Sodium-Potassium Pump:

• Moves Na+ out

• Moves K + in

• Uses ATP to power the protein

Endocytosis:

• Cell shifts the cell membrane in order to bring substances INTO the cell

• transports a bulk of molecules or molecules that are too large into the cell

• Uses a lot of energy and is NOT always safe

Exocytosis

• Cells shift the cell membrane to get rid of substances from the cell

• Uses a lot of energy

• transports a bulk of molecules out of the cell

• Uses alot of energy ATP