PhysioEx 8 Practice Test

What are the main carbohydrate products produced when amylase acts on starch?

Maltose and Glucose Fructose and Galactose Sucrose and Lactose Only Glucose

Correct Answer:

Maltose and Glucose

Explanation:

Amylase breaks down starch by cutting the alpha-1,4 glycosidic bonds, producing smaller glucose units. The main immediate product of this action is maltose, a disaccharide of two glucose units, with some other small glucose-containing units like maltotriose and dextrins also formed. In the digestive tract, enzymes at the brush border (such as maltase) then convert maltose into glucose. So maltose and glucose together represent the primary carbohydrate products you get when amylase acts on starch. Fructose, galactose, sucrose, and lactose are not produced from starch by amylase digestion.

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