_ is/are a non-reducing sugar.
Correct answer: B. Sucrose
- A. Glucose and fructose
- B. Sucrose
- C. Fructose and maltose
- D. Galactose
Explanation
A reducing sugar must have a free hemiacetal group. In sucrose, the anomeric carbons of both the glucose and fructose units are involved in the glycosidic bond, so there is no free hemiacetal. Therefore, sucrose is a non-reducing sugar.
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Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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