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Polysaccharide - Simple English Wikipedia, the free encyclopedia

Polysaccharide

From the Simple English Wikipedia, the free encyclopedia that anyone can change

Polysaccharides are relatively complex carbohydrates.

They are polymers made up of many monosaccharides. They are very large, often branched, molecules. They tend to be amorphous, insoluble in water, and have no sweet taste.

When all the constituent monosaccharides are of the same type they are termed homopolysaccharides; when more than one type of monosaccharide is present they are termed heteropolysaccharides.

Examples include storage polysaccharides such as starch and glycogen and structural polysaccharides such as cellulose and chitin.

[change] Starches

Starches are insoluble in water. They can be digested by hydrolysis, catalyzed by enzymes called amylases. Humans and other animals have amylases, so they can digest starches. Potato, rice, wheat, and maize are major sources of starch in the human diet.

[change] Cellulose

The structural components of plants are formed primarily from cellulose. Wood is largely cellulose and lignin, while paper and cotton are nearly pure cellulose. Cellulose is a polymer made with repeated glucose units. Humans and many other animals do not digest cellulose. Certain animals can digest cellulose, because bacteria possessing the enzyme are present in their gut. The classic example is the termite.

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