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 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 monomers

b. 40 types of monomers

c. 30 types of monomers

d. only one type of monomer

A)correct option-A 

B)Explanation of correct option-

All proteins are made up of different arrangements of the same 20 kinds of amino acids.