Concept:
Glycogen is the storage carbohydrate of animals.
Step 1: Identify monomer unit.
Glycogen consists entirely of:
\[
\alpha-D\text{-glucose}
\]
units joined by
\[
\alpha(1\rightarrow4)
\]
and
\[
\alpha(1\rightarrow6)
\]
glycosidic linkages.
Step 2: Classify polymer.
Since only one type of monomer is present, glycogen is a homopolymer.
\[
\boxed{\text{Glucose}}
\]