Starch can be found in the phloem in plants and in the liver and muscles in mammals, while cellulose can be found in all plant cells. Moreover, in mammals, glycogen is found in the liver and muscle cells.
Starch is a complex carbohydrate composed of many subunits called monomers (i.e., glucose subunits).
This complex carbohydrate (starch) is used as long-term storage of energy, being found in the phloem of plants and liver/muscles of animals (mammals).
Moreover, glycogen is a branched complex carbohydrate also composed of linear chains of glucose monomers.
This complex carbohydrate (glycogen) is synthesized and stored in cells of the liver and muscles.
Finally, cellulose is a complex carbohydrate composed of β-1,4 glucose units, which is the main component of the cell walls (present in all plant cells).
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