A particular mRNA is 300 nucleotides long. If a mutation in the middle of the sequence changed a codon from a AAA to a UAA then what would be a reasonable prediction? O The protein coded by this mRNA would not form due to a failure in initiation. O The protein coded by this mRNA would be the same size. O The protein coded by this mRNA would be shorter The protein coded by this mRNA would kill the cell. O The protein coded by this mRNA would be longer.

Question

08-01-2020
Biology

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A particular mRNA is 300 nucleotides long. If a mutation in the middle of the sequence changed a codon from a AAA to a UAA then what would be a reasonable prediction? O The protein coded by this mRNA would not form due to a failure in initiation. O The protein coded by this mRNA would be the same size. O The protein coded by this mRNA would be shorter The protein coded by this mRNA would kill the cell. O The protein coded by this mRNA would be longer.

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Phoca Phoca · Answer 1 · 2020-01-09T10:10:08+01:00

Answer:

The protein coded by this mRNA would be shorter

Explanation:

The translation process translates the nitrogenous bases present in the mRNA to the amino acids which bind to form a protein molecule.

The nitrogenous bases are read from the 5' to 3' direction in the form of triplets called codons. Each codon codes for a specific amino acid.

In the given question when a mutation changes the codon AAA which codes for lysine to UAA which has no amino acid thus it acts as a stop codon. This results in the shorter proteins as the translation process gets stopped at UAA codon.

Thus, the selected option is the correct answer.