Which one of the following is not a polymer?

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Starch

Protein

RNA

Lipid

answer is D.

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Detailed Solution

A polymer is a molecule made up of repeated units. Lipid is not a polymer.It is a heterogenous group of compounds mainly composed of hydrocarbon chains. As per the molecular weight it is a micro molecule (ranges 18 -800 daltons). But during acid hydrolysis of a living tissue, it is isolated as part acid insoluble fraction along with other biomacromolecules as it forms vesicles.

Starch is a polysaccharide. It is a polymer of alfa glucose subunits linked by glycosidic bonds.

Protein is a polymer of amino acids linked by peptide bonds.

RNA is a nucleic acid. It is a polymer of ribonucleotides linked by phosphodi ester bonds.

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