Absorption of digestion products Quiz
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5 questions, one answer each
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1. Which protein is directly responsible for building the sodium ion gradient used in glucose absorption?
- A. The glucose co-transporter
- B. The sodium-potassium pump
- C. A glucose channel protein in the blood capillary
- D. Lipase in the lumen
2. Glucose is absorbed into an epithelial cell by co-transport. What is the best description of this process?
- A. Glucose and sodium ions diffuse through the bilayer together
- B. Glucose is pumped in directly using ATP hydrolysed by the co-transporter
- C. Glucose enters by endocytosis along with sodium ions
- D. Glucose is carried in with sodium ions through the same protein, against its concentration gradient
3. Why do monoglycerides and fatty acids not need a carrier protein to enter epithelial cells?
- A. They are small and polar
- B. They are lipid-soluble and diffuse through the phospholipid bilayer
- C. They are hydrolysed by the membrane
- D. They are carried by sodium ions
4. What is the main role of micelles?
- A. To hydrolyse triglycerides
- B. To transport glucose into the cell
- C. To carry lipid digestion products to the cell-surface membrane and maintain a high concentration there
- D. To make the lumen more acidic
5. A drug blocks the sodium-potassium pump in ileum epithelial cells but not the co-transporter. What is the most likely effect on glucose absorption?
- A. No effect, as glucose diffuses freely
- B. It increases because sodium ions accumulate in the cell
- C. It decreases because the sodium ion gradient falls and less glucose is carried in
- D. It stops immediately because the co-transporter is blocked