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what is the difference between starch and glycogen

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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The main difference between starch and glycogen is in the way the glucoses are polymerized.  In S, you have alpha 1-4 with some alpha 1-6 branches.  In glycogen you have alpha 1-4 with a lot of alpha 1-6 branches
 
Starch is mainly easily converted by plants.
Glycogen is mainly easily converted by animals.
 
Both are considered as alpha glucose polymers.