Question

Sucrose is broken down in the lining layer of intestine to form fructose and glucose. The products are

• A. Passed into blood
• B. Poured into intestinal lumen
• C. Utilised in the living cells
• D. Passed inwardly to supply the whole wall of intestine

Answer 1

Answer: (B)

Poured into intestinal lumen

Large food molecules (for example, proteins, lipids, nucleic acids, and starches) must be broken down into sub-units that are small enough to be absorbed by the lining of the alimentary canal. This is accomplished by enzymes through hydrolysis. In the small intestine, pancreatic amylase does the ‘heavy lifting’ for starch and carbohydrate digestion. After amylases break down starch into smaller fragments, the brush border enzyme α-dextrinase starts working on α-dextrin, breaking off one glucose unit at a time. Three brush border enzymes hydrolyze sucrose, lactose, and maltose into monosaccharides. Sucrasesplits sucrose into one molecule of fructose and one molecule of glucose.

So, the correct option is 'Poured into intestinal lumen'.