which possible mutation of the DNA triplet GAC will affect the production of a protein by the gene that contains this triplet
To answer this question we need to look at the genetic code to see what amino acid GAC triplet codes.
As is in DNA we need to pass it to RNA
GAC = CUG = Leu
Now we have four possible options, so we need to obtain the RNA triplet and look at the genetic code so we can see what each code.
A.- ATC = UAG = Stop
B.- AAC = UUG = Leu
C.- GAT = CUA = Leu
D.- GAA = CUU = Leu
So options B to D all code for leucine, the same amino acid as the original triplet, meanwhile option A does not code for another triplet but is a Stop codon, meaning that protein production will stop there, so the correct answer is option A as a premature stop definitely will leave the protein unfinished and with no function or defective.
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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.