Diffusion of Glucose and Starch

The video tutorial covers an osmosis and diffusion lab experiment. It begins with hypotheses about glucose and starch diffusion through a cellulose membrane. The procedure involves placing glucose and starch solutions in cellulose tubing and observing diffusion in distilled water. The results show that iodine diffuses into the tubing, while glucose diffuses out, confirming selective permeability of the membrane. The conclusion explains that starch molecules are too large to pass through the membrane, unlike smaller water, iodine, and glucose molecules.

What was the hypothesis regarding glucose diffusion in the experiment?

• Glucose would remain inside the cellulose tubing.

• Glucose would diffuse into the distilled water.

• Glucose would react with iodine.

• Glucose would not diffuse at all.

What was the expected outcome for starch in the experiment?

• Starch would not interact with iodine.

• Starch would diffuse into the distilled water.

• Starch would remain inside the cellulose tubing.

• Starch would react with glucose.

What was the first step in the procedure for testing glucose diffusion?

• Measuring the pH of the starch solution.

• Placing glucose solution into cellulose tubing.

• Adding iodine to the glucose solution.

• Heating the glucose solution.

During the procedure, what was added to the starch solution?

• Glucose

• Iodine

• Salt

• Vinegar

What was observed about iodine in the results?

• Iodine diffused into the cellulose tubing.

• Iodine did not diffuse at all.

• Iodine diffused out of the cellulose tubing.

• Iodine reacted with glucose.

What was the conclusion regarding starch diffusion?

• Starch was too small to diffuse.

• Starch reacted with iodine.

• Starch remained inside the cellulose tubing.

• Starch diffused into the distilled water.

Why did glucose molecules diffuse through the cellulose membrane?

• They are larger than water molecules.

• They are small enough to fit through the membrane pores.

• They are smaller than iodine molecules.

• They reacted with iodine.

What determines whether a molecule can diffuse through the cellulose membrane?

• The pH of the solution

• The color of the molecule

• The temperature of the solution

• The size of the molecule

What is the main reason starch did not diffuse through the membrane?

• Starch molecules are soluble.

• Starch molecules are reactive.

• Starch molecules are too small.

• Starch molecules are too large.

What characteristic of the membrane allows it to be selective?

• Its color

• Its thickness

• Its temperature

• Its pore size