Introduction to Active and Passive Transport

Multiple Choice

What is passive transport?

• Movement of molecules against the concentration gradient requiring ATP.

• Movement of water only through the cell membrane.

• Movement of molecules through a protein that requires energy.

• Movement of molecules down their concentration gradient without energy.

Multiple Choice

Which of the following is an example of facilitated diffusion?

• Oxygen diffusing across the membrane.

• Sodium-potassium pump activity.

• Glucose moving through a protein channel.

• Water exiting the cell in a hypertonic solution.

Fill in the Blank

The process by which water moves across a selectively permeable membrane is called __________.

Draw

Label each diagram with isotonic, hypertonic, or hypotonic and show me the direction where water would flow