Starch, Glycogen and Cellulose

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  • Created by: Amy
  • Created on: 27-03-12 21:13


Polysaccharide found in many parts of a plant, it is made up of chains of alpha glucose monosaccharides linked by glycosidic bonds formed by condensation reactions. The unbranched chain is wound into a tight coil making the molecule very compact.

The main role of starch is as energy storage something especially suited for because:

  • It is insoluble an therefore does not tend to draw water into the cells by osmosis
  • being insoluble, it does not easily diffuse out of cells 
  • it is compact, so a lot of it can be stored in a small space
  • when hydrolysed it forms alpha glucose, which is both easily transported and readily used in respiration. 
  • Starch is never found in animal cells but a similar polysaccharide, glycogen is.


Similar in structure to starch but has shorter chains…


Ryan Martin


Diagrams would be a great addition

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