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?

Correct Answer: A

Rationale: Only reducing sugars can pass through the membrane, turning Benedict's solution red, while starch cannot.

Correct Answer: B

Rationale: Peristalsis is the rhythmic muscular action that moves food through the digestive tract.

Correct Answer: B

Rationale: In the intestinal phase, chyme is mixed with pancreatic juice and bile, and nutrients are absorbed primarily in the small intestine.

Correct Answer: C

Rationale: The vermilion zone's epithelium is thinner than the outer labial skin, not thicker, allowing the underlying vascularity to show through, giving it a red appearance.

Correct Answer: A

Rationale: Foliate papillae are located on the posterolateral sides of the tongue, not the tip, and are rudimentary in humans but prominent in rabbits.