Heteropolysaccharides:

 The composition of heteropolysaccharides is complex. It has a variety of sugar residues in non-uniform proportions. 

Agarose is a natural heteropolysaccharide derived from red seaweed, and it is a structural part of its cell wall.

Chitin is a homopolysaccharide made up of N-acetyl glucosamine units.

Glucose is a monomer,it is not a polysaccharide.

Cellulose is a polymer of beta glucose units.

Agar is a poly-sulphated ester of galactose subunits.