Fick's law of diffusion states that the rate of diffusion is directly proportional to theMultiple choice question.size of the molecules.distance across which diffusion occurs.pressure difference.

Select all that applyAccording to Fick's law, what variables are important in the diffusion of a gas across cellular membranes?Multiple select question.The partial pressure of all the other gases on both sides of the membraneThe difference in the concentration of the gas on both sides of the membraneThe thickness of the membraneThe amount of oxygen binding proteins on both sides of the membrane

Which variables affect the rate of diffusion? Check all that apply.Check All That ApplySolubility of moleculesSolubility of moleculesSize of moleculesSize of moleculesConcentration gradientConcentration gradientPolarity of molecules

As the size of a solute molecule decreases, _____.Group of answer choicesthe rate of diffusion increaseschange in rate of diffusion is unaffectedthe rate of diffusion decreaseschange in rate of diffusion is unpredictableNext

Which of the following is true about diffusion?Multiple choice question.Molecules move against their concentration gradients.Molecules move down their concentration gradients.

1. Describe two variables that affect the rate of diffusion. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? __________________________________________________________________________________________________ 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. __________________________________________________________________________________________________ __________________________________________________________________________________________________ Simulated Facilitated Diffusion 1. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Explain your prediction for the effect Na+Cl- might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction? __________________________________________________________________________________________________ Simulating Osmotic Pressure 1. Explain the effect that increasing the Na+Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Solutes are sometimes measured in milliosmoles. Explain the statement, "Water chases milliosmoles"