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A disaccharide is formed by -------------- linkage between two monosaccharides

Question

A disaccharide is formed by -------------- linkage between two monosaccharides

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Solution

A disaccharide is formed by a glycosidic linkage between two monosaccharides.

Here are the steps:

  1. Two monosaccharides are brought close together. These are simple sugars like glucose or fructose.

  2. A hydroxyl group (-OH) on one monosaccharide comes into proximity with a hydrogen atom (H) on the other monosaccharide.

  3. A molecule of water (H2O) is removed in a process called dehydration synthesis. This is where the term "glycosidic linkage" comes from - "glyco" refers to sugar, and "sidic" refers to the process of removing water.

  4. The removal of water allows a new covalent bond to be formed between the two monosaccharides, creating a disaccharide.

  5. The resulting disaccharide has a glycosidic linkage, which is the bond that holds the two sugar units together.

Examples of disaccharides include sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (glucose + glucose).

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