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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In living organisms, the disaccharide sucrose is classified as a non-reducing sugar because the glycosidic bond is formed between

A. The anomeric carbons of glucose and fructose, locking both carbonyl groups
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B. The C-1 of one glucose and the C-4 of another glucose
C. The C-1 of galactose and the C-4 of glucose
D. The C-1 of glucose and the C-2 of fructose, where fructose is in a ketose open-chain form

📝 Explanation

Sucrose consists of α-D-glucose and β-D-fructose linked via a glycosidic bond between their anomeric carbons (C1 of glucose and C2 of fructose). Since both anomeric carbons are involved, neither unit can open to expose a free carbonyl group, making it a non-reducing sugar.

📖 Additional Information

  • The anomeric carbons of glucose and fructose, locking both carbonyl groups
  • The C-1 of one glucose and the C-4 of another glucose
  • The C-1 of galactose and the C-4 of glucose
  • The C-1 of glucose and the C-2 of fructose, where fructose is in a ketose open-chain form

Sucrose consists of α-D-glucose and β-D-fructose linked via a glycosidic bond between their anomeric carbons (C1 of glucose and C2 of fructose). Since both anomeric carbons are involved, neither unit can open to expose a free carbonyl group, making it a non-reducing sugar.

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