Question

the models show the structures of the carbohydrates cellulose, starch, and glycogen.
cellulose branched starch glycogen
compare the chemical structures of cellulose, starch, and glycogen.
table with columns: cellulose, starch, glycogen; rows: has a branched structure, is a polysaccharide, has (parallel) chains

Explanation:

1. Branched Structure: Cellulose has a linear (unbranched) structure of glucose units linked by β - 1,4 glycosidic bonds. Starch (specifically amylopectin, a component of starch) and glycogen have branched structures (with α - 1,6 glycosidic bonds at branch points in addition to α - 1,4 bonds). For branched starch (as shown) and glycogen, they are branched, while cellulose is not.
2. Polysaccharide: All three (cellulose, starch, glycogen) are polysaccharides, meaning they are polymers made up of many monosaccharide (glucose) units.
3. Parallel Chains: Cellulose molecules form parallel chains that can hydrogen - bond with each other, giving it a rigid structure. Starch (even branched starch) and glycogen do not have this parallel chain arrangement; their structures are more branched or, in the case of amylose (a linear part of starch), just linear but not in parallel arrays like cellulose.

Answer:

	cellulose	starch	glycogen
is a polysaccharide	√	√	√
has (parallel) chains	√	×	×