Distinguish between monosaccharides, disaccarides and polysaccharides (glycogen and starch - amylose and amylopectin) and relate their structures to their roles in providing and storing energy (alpha-glucose and cellulose are not required in this topic).

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  • Sugars and starch are composed of many single sugar units put together.
  • One of these units is called a monosaccharide.
  • Two are called a disaccharide.
  • Three or more become a polysaccharide.

Starch (found in plants)

  • made up of polysaccharides in two main molecules - amylose and amylopectin.
  • Amylose is a straight chain between 200 and 5000 glucose molecules with 1,4 glycosidic


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