Go to my website, click on the ‘Membranes & Transport’ page and use the links at the bottom to watch animations focusing on transport across membranes, diffusion and osmosis ( Membrane Transport
Animation, How Diffusion Works , How Osmosis Works ). Based on the animations, answer the following questions.
Membrane Transport
What is passive transport?
What is facilitated diffusion? Does it require energy?
What is needed for active transport?
Describe exocytosis and endocytosis.
How Diffusion Works
Why do molecules have a tendency to distribute themselves throughout a solution?
What factors affect the rate of diffusion?
Explain what is meant by a concentration gradient of a substance.
When does diffusion end?
Explain how a cube of sugar dissolves in a beaker of water. Include a discussion of concentration gradients.
How Osmosis Works
What is osmosis?
When solutes (molecules) are added to water, what do the water molecules do?
In the animation “How Osmosis Works”, explain why the water on the right side of the beaker rose.
Define isotonic.