Question

if a mutation in a long chain of codons changes a codon sequence of one codon from cuu to cuc, what effect would that have on the protein produced?
the protein will no longer function.
both of the codons code for the same amino acid and no change would be observed in the protein.
the protein will no longer function or it may function more efficiently.
only one amino acid would be different and this would not affect the protein.
the protein may function more efficiently.

Explanation:

Codons CUU and CUC both correspond to the amino acid leucine. Since the amino acid sequence of the protein remains unchanged, the protein's structure and function are unaffected. This is an example of a silent mutation due to the degeneracy of the genetic code.

Answer:

B. Both of the codons code for the same amino acid and no change would be observed in the protein.