Question: what is the major structural differences between starch and glycogen?
Answer: Starch has coiled and unbranched (amylose) or long, branched (amylopectin) while the chains of glycogen are short and highly branched chains. Amylose is water soluble, and amylopectin is water-insoluble, but glycogen is soluble to a small extent, as they are highly branched.