Consider the given mRNA sequence:
5' GGA | UUC | AAC | CUA 3'
Provide the amino acid sequence resulting from a mutation that alters CUA to UUA. Is the protein function affected by the mutation?

• A. Gly-Phe-Ser-Pro; The protein function is affected by the mutation.
• B. Gly-Phe-Arg-Leu; The protein function is not affected by the mutation.
• C. Gly-Phe-Thr-Ser; The protein function is affected by the mutation.
• D. Gly-Phe-Asn-Leu; The protein function is not affected by the mutation.

Answer: (D)