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# Proteins are polymers of

$\begin{array}{1 1}(a)\;\beta-\text{amino acids}\\(b)\; \alpha-\text{amino acids}\\(c)\;\text{glucose}\\(d)\;\text{isoprene}\end{array}$

Proteins are polymers of $\alpha$-amino acids.They have generally 20 to 1000 $\alpha$-amino acids joined together in a highly organised arrangement.
Hence (b) is the correct answer.