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A homopolymer has only one type of building block called monomer repeated 'n' number of times. A heteropolymer has more than one type of monomer. Proteins are heteropolymer usually made of
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20 types of monomers
20 types of monomers
The function and shape of a protein is affected by sequence of 20 types of amino acids, each having an amino group $-\mathrm{NH}_2$, a carboxylic acid group $-\mathrm{COOH}$, a hydrogen atom each attached to carbon located next to $-\mathrm{COOH}$ group and a side chain $\mathrm{R}$ which varies from one amino acid to other. (It can be hydrogen or an aliphatic group, an aromatic or heterocyclic group).
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