Exploring Diffusion and Osmosis in AP Biology Lab 1

Mr. Anderson introduces AP Biology Lab 1, 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 semi-permeable membrane. The diffusion lab uses dialysis tubing to demonstrate molecular movement, while the osmosis lab involves placing potato cores in various sugar concentrations to observe mass changes. The video provides detailed explanations and examples to help students understand these processes.

What is the main focus of the AP Biology Lab 1?

• Genetics and Evolution

• Diffusion and Osmosis

• Cell Division and Growth

• Photosynthesis and Respiration

Tags

NGSS.HS-LS1-4

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What is diffusion?

• Movement of molecules from an area of high concentration to low concentration

• Movement of ions across a cell membrane

• Movement of molecules from an area of low concentration to high concentration

• Movement of water across a semipermeable membrane

Tags

NGSS.HS-LS2-4

In the diffusion example with the jar, what happens after 15 minutes?

• The sugar molecules move to create an equal concentration on both sides

• The sugar molecules remain on one side

• The membrane becomes impermeable

• The water molecules move to one side

What is osmosis?

• Movement of molecules from low to high concentration

• Movement of ions across a cell membrane

• Movement of solute molecules across a semipermeable membrane

• Movement of water across a semipermeable membrane

In osmosis, what happens when one side is hypertonic?

• Water moves to the hypertonic side

• Water moves to the hypotonic side

• Solute moves to the hypertonic side

• Solute moves to the hypotonic side

What is dialysis tubing used for in the diffusion lab?

• To separate different types of cells

• To store chemicals

• To simulate a semipermeable membrane

• To measure the concentration of solutions

What indicates the presence of starch in the diffusion lab?

• A yellow color

• A green color

• A red color

• A blue color

What is the purpose of the potato lab?

• To observe the effects of different sugar concentrations on potato mass

• To analyze the genetic makeup of potatoes

• To measure the rate of photosynthesis

• To study the growth of potato cells

What happens to the mass of potatoes in distilled water?

• It decreases

• It fluctuates

• It remains the same

• It increases

How can the molarity of potatoes be determined in the potato lab?

• By counting the number of cells

• By measuring the change in color

• By testing the pH level

• By observing the change in mass