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 heteropolymers usually made of
A
20 types of monomer
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B
40 types of monomer
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C
30 types of monomer
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D
Only one type of monomer
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Solution
The correct option is A 20 types of monomer
The function and shape of a protein is affected by sequence of 20 types of amino acids, each having an amino group -NH2, a carboxylic acid group - COOH, a hydrogen atom each attached to carbon located next to −COOH grou and a side chain R which varies from one amino to other. (It can be hydrogen or an aliphatic group,an aromatic or heterocyclic group).