AP Biology Lab 1: Diffusion and Osmosis

Mr. Anderson guides students through an AP Biology lab focusing on diffusion and osmosis. The video explains diffusion as the movement of molecules from high to low concentration and osmosis as the movement of water across a semipermeable membrane. The diffusion lab uses dialysis tubing to demonstrate molecular movement, while the potato lab explores osmosis by measuring mass changes in potato cores placed in various sugar solutions.

What is the main focus of the AP Biology lab introduced by Mr. Anderson?

• Cell Division and Growth

• Photosynthesis and Respiration

• Diffusion and Osmosis

• Genetics and Heredity

In the diffusion example with a jar, what happens to the sugar molecules over time?

• They remain stationary.

• They achieve equal concentration on both sides.

• They move to one side of the jar.

• They disappear completely.

What is the key difference between diffusion and osmosis?

• Diffusion involves only gases, while osmosis involves liquids.

• Diffusion requires energy, while osmosis does not.

• Diffusion occurs in living organisms, while osmosis does not.

• Diffusion is the movement of solutes, while osmosis is the movement of water.

In the osmosis example, why do sugar molecules not move across the membrane?

• They are too large to pass through.

• They are repelled by water.

• They dissolve in the membrane.

• They are already in equilibrium.

What is the purpose of using dialysis tubing in the diffusion experiment?

• To measure temperature changes.

• To simulate a semipermeable membrane.

• To hold the solution in place.

• To filter out impurities.

How can the presence of starch be detected in the experiment?

• By observing a color change with IKI.

• By measuring the temperature.

• By checking the mass of the solution.

• By using a pH indicator.

In the potato lab, what happens to the mass of potatoes in distilled water?

• The mass increases.

• The mass remains the same.

• The mass fluctuates.

• The mass decreases.