Mr. Warren explains the concepts of diffusion and osmosis, focusing on the terms hypotonic, hypertonic, and isotonic. He uses a YouTube analogy to illustrate how concentration gradients affect diffusion and osmosis. The video includes calculations for equilibrium concentrations of glucose and fructose, emphasizing the importance of understanding membrane permeability. The tutorial concludes with a summary of key vocabulary and concepts.

What does the term 'hypotonic' mean?

• Not concentrated at all

• With the same concentration

• Less concentrated than

• More concentrated than

Tags

NGSS.HS-PS1-5

Which term can be used by itself without comparison?

• Hypotonic

• Hypertonic

• Isotonic

• None of the above

In the YouTube setup, if side A has less dissolved material than side B, how can we describe side A?

• Isotonic to side B

• Hypertonic to side B

• Hypotonic to side B

• None of the above

Why can't the purple circles move through the membrane in the YouTube setup?

• They are too large

• The membrane is not permeable to them

• They are not dissolved

• They are not in the solution

What creates an osmotic gradient in the YouTube setup?

• Higher concentration of water on side A

• Equal concentration of water on both sides

• Higher concentration of water on side B

• No concentration difference

What happens to the water level on side B in the YouTube setup?

• It fluctuates

• It decreases

• It remains the same

• It increases

Tags

NGSS.HS-ESS2-5

If the cell has a 0.05 molar concentration and the environment has a 0.03 molar concentration, how can we describe the environment?

• Isotonic to the cell

• Hypertonic to the cell

• Hypotonic to the cell

• None of the above

Which monosaccharides can diffuse through the membrane in the given example?

• None of the above

• Sucrose and fructose

• Glucose and fructose

• Sucrose and glucose

What is the equilibrium concentration of glucose if the initial concentrations are 0.02 molar inside and 0.01 molar outside?

• 0.03 molar

• 0.015 molar

• 0.02 molar

• 0.01 molar

What happens to the size of the cell when water moves in?

• It fluctuates

• It increases

• It remains the same

• It decreases