Refer to an experiment in which a dialysis-tubing bag is filled with a mixture of 3% starch and 3% glucose and placed in a beaker of distilled water, as shown below. After 3 hours, glucose can be detected in the water outside the dialysis-tubing bag, but starch cannot.
(A) The bag will contain more water than it did in the original condition.
(B) The contents of the bag will have the same osmotic concentration as the surrounding solution.
(C) Water potential in the bag will be greater than water potential in the surrounding solution.
(D) Starch molecules will continue to pass through the bag.
(E) A glucose test on the solution in the bag will be negative.
Answer: A
Which of the following best describes the condition expected after 24 hours?
(A) The bag will contain more water than it did in the original condition.
(B) The contents of the bag will have the same osmotic concentration as the surrounding solution.
(C) Water potential in the bag will be greater than water potential in the surrounding solution.
(D) Starch molecules will continue to pass through the bag.
(E) A glucose test on the solution in the bag will be negative.
Answer: A