Polysaccharides - Starch, Amylose, Amylopectin, Glycogen, & Cellulose - Carbohydrates | Summary and Q&A

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October 17, 2019
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Polysaccharides - Starch, Amylose, Amylopectin, Glycogen, & Cellulose - Carbohydrates

TL;DR

This video provides a comprehensive explanation of different polysaccharides, including starch, glycogen, cellulose, and chitin, their structures, and their functions.

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Questions & Answers

Q: What is the main function of starch?

Starch serves as an energy storage polysaccharide in plants. It is found in potatoes and consists of amylose and amylopectin.

Q: How does amylose differ from amylopectin?

Amylose is a straight chain of glucose monomers connected by alpha 1 4 glycosidic bonds. Amylopectin, on the other hand, contains branch structures along with the straight chain.

Q: What is the difference between glycogen and starch?

Glycogen is the animal equivalent of starch and is highly branched in structure. Both contain alpha 1 4 glycosidic bonds, but glycogen also has alpha 1 6 glycosidic bonds responsible for branching.

Q: What is the role of cellulose in plants?

Unlike starch and glycogen, cellulose serves as a structural support polysaccharide in plants. It forms long fibers through beta 1 4 glycosidic bonds between glucose units.

Summary & Key Takeaways

  • Polysaccharides are made up of many sugar units or monomers. Starch is a plant polysaccharide that stores energy, consisting of amylose (straight chain) and amylopectin (branched structure).

  • Glycogen is a highly branched animal starch. Cellulose, found in plants, provides structural support through long fibers and forms beta 1 4 glycosidic bonds. Chitin, found in insects, also serves a structural role.

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