(i) In starch, the glucose monomersa are in alpha configuration while in cellulose, the glucose monomers are in beta configuration. Starch is a polymer consisting of amylose and amylopection while cellulose is a long chain compose only of $\mathit{\beta }$-D-glucose units.
(ii) Phosphodiester linkage between the $5\prime$ and $3\prime$ atoms is present in Nucleic acids.
(iii) Example of fibrous protein - Collagen, keratin, myosin.
Example of globular protein - Insulin, haemoglobin, egg albumin