what is the difference between starch and glycogen

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Answer 1

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.