Exploring Diffusion Through Membranes

The video tutorial covers the diffusion through a membrane lab, a mandatory New York State lab. It is divided into three parts: indicators, model cell, and osmosis. The first part explains the use of Benedict's and iodine as indicators for glucose and starch. The second part demonstrates diffusion using a model cell with dialysis tubing, showing how molecules like glucose and iodine move through pores. The final part explores osmosis in onion cells, illustrating the effects of isotonic, hypertonic, and hypotonic solutions on cell structure.

What are the three main parts of the diffusion through a membrane lab?

• Indicators, model cell, and onion cell

• Indicators, osmosis, and diffusion

• Indicators, glucose test, and starch test

• Model cell, osmosis, and diffusion

Which indicator is used to test for glucose?

• Phenolphthalein

• Methyl orange

• Lugol's iodine

• Benedict's solution

What color change indicates a positive test for glucose with Benedict's solution?

• Blue to orange

• Blue to green

• Amber to blue-black

• Amber to red

What is the initial color of Lugol's iodine?

• Orange

• Green

• Blue

• Amber

What does the model cell experiment use to illustrate diffusion?

• Rubber tubing

• Dialysis tubing

• Glass tubing

• Plastic wrap

Which molecule is too large to pass through the dialysis tubing in the model cell experiment?

• Glucose

• Water

• Starch

• Iodine

What is osmosis?

• Movement of solutes from high to low concentration

• Movement of water from high to low concentration

• Movement of solutes from low to high concentration

• Movement of water from low to high concentration

What happens to a red blood cell in a hypertonic solution?

• It swells and bursts

• It remains the same

• It shrivels and dehydrates

• It changes color

What is the purpose of adding salt water to the onion cell in the experiment?

• To stain the cell

• To create a hypertonic environment

• To create an isotonic environment

• To create a hypotonic environment

What is the effect of adding distilled water to a dehydrated onion cell?

• The cell shrivels further

• The cell remains the same

• The cell changes color

• The cell refills partially or fully