Which of the following types of mutation,resulting in an error in the mRNA just after the 5ʹ AUG start codon,is likely to have the most serious effect on the polypeptide product?
A) a deletion of a codon
B) a deletion of two nucleotides
C) a substitution of the third nucleotide in an ACC codon
D) a substitution of the first nucleotide of a GGG codon
Correct Answer:
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