Nokea
Four bags made of partially permeable membrane are placed in tubes as shown in the diagram. bag made of partially permable membrane starch solution water reducing sugar solution water starch solution and saliva water tube 1 tube 2 tube 3 tube 4 saliva water After 20 minutes at 35 oC a sample of water from each tube, outside the bag, is boiled with Benedict's solution. What are the results?
- A. tube 1: blue, tube 2: red, tube 3: blue, tube 4: red
- B. tube 1: blue, tube 2: blue, tube 3: red, tube 4: red
- C. tube 1: red, tube 2: blue, tube 3: blue, tube 4: red
- D. tube 1: red, tube 2: red, tube 3: blue, tube 4: blue
Correct Answer: A
Rationale: Only reducing sugars can pass through the membrane, turning Benedict's solution red, while starch cannot.
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- A. Erepsin
- B. Trypsin
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Correct Answer: D
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