Starch forms helical structures whereas cellulose does not. Why?

Dear Student.
Please find below the solution to the asked query.

Starch is made of two components helical amylose and branched amylopectin.  Amylose consists of α(1→4) bound glucose molecules.  This α(1→4) structure helps in the formation of a helix structure which helps in the formation of hydrogen bonds between two oxygen atoms bound to the 2nd carbon of one glucose and 3rd carbon of next glucose molecule. 

Cellulose is made up of β(1→4) linked D-glucose units. This does not favor the formation of helical structure, thus it is a linear chain molecule.

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