You have a dna sequence that codes for a protein and is 105 nucleotides long. a frame shift mutation occurs at the 85th base how many amino acids will be correct in this protein? show work and explain answer

In a DNA molecule, three nucleotides make up a codon. A codon is creates a specific amino acid. Therefore, in order to work this out, we must calculate the number of codons that will not be affected by the mutation. This is done by finding the highest number that is divisible by 3 but less than 85. This can be done by:
85 / 3 = 28.333
So 28 codons will not be affected.