2. Describe the difference between the rate of diffusion seen for sodium and urea.You correctly answered: c. Urea diffused more slowly because it is larger than sodium. 3. Which of the following solutes did not pass through any of the membranes? You correctly answered: b. albumin 4. When diffusion stops, we say the solution has reached You correctly answered: a. equilibrium.
02/15/17 page 5 Review Sheet Results 1. Describe two variables that affect the rate of diffusion.Your answer: 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results comparewith your prediction? 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did theresults compare with your prediction? 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. Your answer: Sodium chloride, Urea, Glucose, Albumin.
Name: Karen Brito Exercise 1: Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because You correctly answered: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion? You correctly answered: c. Movement is passive and down a concentration gradient. 3. Examples of solutes that might require facilitated diffusion include You correctly answered: d. all of the above. 4. Which of the following would not affect the rate of facilitated diffusion? You correctly answered: a. the amount of intracellular ATP 02/15/17 page 1
02/15/17 page 2 Experiment Results Predict Question: Predict Question 1: What effect do you think increasing the number of protein carriers will have on the glucose transport rate? Your answer : b. The glucose transport rate will increase. Predict Question 2: What effect do you think adding Na+ Cl- will have on the glucose transport rate? Your answer : c. There will be no change in the glucose transport rate. Stop & Think Questions: What happened to the glucose transport rate when the glucose concentration was increased from 2 m M to 8 m M ? You correctly answered: a. The glucose transport rate increased. Describe the conditions that resulted in the fastest rate of glucose transport. You correctly answered: d. 700 glucose carrier proteins and 8 m M glucose Why do you think equilibrium wasn't reached?
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