If a polypeptide chain is 30 amino acids, how many nucleotides will make up the coding mRNA strand? 93
30
33
90
96

3 nucleotide require to produce one amino acid.As 30 amino acid , it requires 90 nucleotides including start codon but a polypeptide chain have a stop codon at last therefore 93 nucleotide will make up the coding mRNA strand.

The stop codon may be UAA ,UAG ,UGA they encode no amino acid.

it will increase due to the time span