Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination - UPV EHU (2o Bachillerato 2026) Exam

Why is sucrose considered a non-reducing disaccharide, unlike maltose and lactose?

The glycosidic bond involves the anomeric carbons of both glucose (alpha-1) and fructose (beta-2), leaving no free anomeric hydroxyl group. Sucrose lacks hydroxyl groups capable of participating in oxidation-reduction reactions. Sucrose is composed exclusively of beta-D-galactose monomers joined by beta-1,4-bonds. Sucrose spontaneously hydrolyzes into free carboxylic acids in aqueous solution.

Correct Answer:

The glycosidic bond involves the anomeric carbons of both glucose (alpha-1) and fructose (beta-2), leaving no free anomeric hydroxyl group.

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