Starch is composed of many maltose units.

glycogen

Glucose. Starch is a polymer made of glucose monomers.

No, starch is held together by a-1,4 glycosidic linkages. Carbohydrates, starch in this case, form glycosidic bonds while proteins (amino-acids) are the ones that form peptide bonds.!!!

Both starch and cellulose are polymers of glucose. However, the individual glucose units are linked differently in the two. Humans have an enzyme which is capable of breaking the linkages used to form starch, but do not have one that can break the linkage used to form cellulose. (If you want the technical terms, cellulose uses a beta(1-4) link and starch uses both alpha(1-4) and alpha(1-6) links.)