Two sugar solutions of equal concentration are separated by a membrane which is permeable to sugar molecules. Some of the sugar molecules on the right side of the membrane contain
biology exercise
Requirements: short or long
Membrane Transport Problems: Solve the problems below in the spaces provided. Each should have a before picture (given), an after picture (modified by you to show what is happening), and a detailed explanation of the results. You will be able to use this worksheet to take the quiz afterward.
1. Two sugar solutions of equal concentration are separated by a membrane which is permeable to sugar molecules. Some of the sugar molecules on the right side of the membrane contain radioactive carbon. (Making a molecule radioactive serves to label it so that specific molecules can be identified later. Other than that, a labeled molecule has the same physical properties as an unlabeled molecule.) What would you predict would be the final distribution of radioactive sugar on the two sides of the membrane some time later? Complete the diagram below and discuss. Explain what caused in the result you see?
2. A similar container as above is separated by a membrane with unknown permeability properties. To compartment A was added a 10% aqueous salt solution and to compartment B was added pure water. A student predicted that the solution in compartment A would be less than 10% salt if measured the next day. What was this student most likely assuming? (Hint: there are three different assumptions the student could be making about the permeability characteristics of this membrane which would have the same result?I have done the first one for you. State the other two and explain what would happen to make the students statement true.)
3. A student placed a dialysis bag (essentially a sack made from membrane) containing a 10% glucose solution into a beaker also containing a 10% glucose solution. The dialysis bag was permeable to both glucose and water. If the student measured glucose movement out of the bag and glucose movement into the bag, which of the following would she most likely find? Explain your answer, and why you could rule out the others.
(Note: The numbers below indicate roughly how many thousand glucose molecules pass through the membrane in a given direction.)
The student in problem 3 now adds to the solution in the beaker an enzyme which rapidly breaks down glucose. This means that the concentration of glucose in the beaker will be effectively 0 in short order. Which of the following would most likely occur? Assume the enzyme cannot diffuse through the membrane and does not appreciably change the water concentration. Indicate your choice from the list below and explain it in words and on the diagram.
The apparatus depicted below consists of two chambers, open to the air, but separated by a membrane. Assume that the membrane is permeable to water but not to solute. On the left side is pure water. On the right side is an equal volume of starch solution. Which of the following is the best prediction of the results several hours later?
Explain your answer.
There will be more water on the left than on the right.
There will be equal volumes of water on the two sides.
There will be more water on the right than on the left.
There will be equal amount of carbohydrate on the two sides.
Both b and d are equally likely.
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