Which row shows correct information about three digestive enzymes in humans?
▶️ Answer/Explanation
Ans: D
The correct functions and sites of action for the enzymes are:
- Lipase breaks down fats into fatty acids and glycerol in the small intestine (alkaline conditions).
- Maltase converts maltose into glucose in the small intestine.
- Trypsin digests proteins into peptides in the small intestine (activated from trypsinogen in alkaline pH).
Option D matches all these descriptions accurately, making it the correct choice.
The diagrams show carbohydrate molecules as they pass through the alimentary canal.
Which row represents the molecules correctly?
▶️ Answer/Explanation
Ans: B
Carbohydrate digestion begins with starch (polysaccharides) in the mouth, where salivary amylase breaks it into smaller sugars. In the small intestine, enzymes like pancreatic amylase further break it down into glucose (monosaccharides).
Row B correctly shows this progression: long starch chains → partially broken chains → single glucose units. The other rows either skip digestion stages or show incorrect molecular states.