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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

A critical structural feature of the disaccharide cellobiose, a product of cellulose degradation, is that it consists of two glucose units linked by a

A. β-1,4 glycosidic bond
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B. α-1,4 glycosidic bond
C. α-1,2 glycosidic bond
D. β-1,6 glycosidic bond

📝 Explanation

Cellobiose is the repeating disaccharide unit of cellulose and is formed by partial hydrolysis. It consists of two β-D-glucose molecules linked by a β-1,4 glycosidic bond. It is an isomer of maltose, which has an α-1,4 linkage.

📖 Additional Information

  • β-1,4 glycosidic bond
  • α-1,4 glycosidic bond
  • α-1,2 glycosidic bond
  • β-1,6 glycosidic bond

Cellobiose is the repeating disaccharide unit of cellulose and is formed by partial hydrolysis. It consists of two β-D-glucose molecules linked by a β-1,4 glycosidic bond. It is an isomer of maltose, which has an α-1,4 linkage.

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The reason that a freshly prepared solution of α-D-glucose has a different optical rotation from an equilibrium mixture is that mutarotation has not yet established the equilibrium between the α and β anomers. The open-chain form is a necessary intermediate in this process, and its concentration at equilibrium is extremely low (less than 0.1%) because

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The glycosidic bond in a disaccharide is formed between the anomeric carbon of one sugar and a hydroxyl carbon of another, releasing a water molecule. In the nomenclature, the bond is named by specifying the anomeric configuration (α or β) of the first sugar and the carbon numbers involved. Thus, the name "α-1,4 glycosidic bond" indicates that the

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