the mRNA squence below is shown along with the polypeptide which would be produced when it is translated .what polypeptide would be produced if the fifth base in the mRNA sequence shown had been changed to A as result of a mutation in the DNA from which the mRNA wa transcribed ?

AUG UGU AAU GGG
Met Cys Asn Gly
fill in the boxes to show the new amino acid sequence using the abbreviated form of each one
1......2......3......4......

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Original mRNA strand: AUG UGU AAU GGG

Mutated mRNA strand:AUG UA*U AAU GGG
*mutated RNA base

Original polypeptide:
1.Met 2.Cys 3.Asn 4.Gly

Mutated ploypeptide:
1.Met 2.Tyr 3.Asn 4.Gly

I am not Jiskha's bio expert, but I have a little bit of experience in the area.

I hope this helps.

thanks for ur help

To determine the new polypeptide sequence resulting from the mutation, we need to know the amino acid that corresponds to the codon with the changed base.

The original mRNA sequence:
AUG UGU AAU GGG

The fifth base in the mRNA sequence is changed to 'A' due to the mutation. Therefore, the new mRNA sequence will be:
AUG UGU AA** GGG

To find out the new amino acid, we can refer to the codon chart, also known as the genetic code table. This table associates each three-letter mRNA codon with a specific amino acid.

Let's break down the codons in the new mRNA sequence:

Codon 1: AUG - This codon codes for the amino acid Methionine (Met).
Codon 2: UGU - This codon codes for the amino acid Cysteine (Cys).
Codon 3: AA** - This codon codes for the amino acid Lysine (Lys) instead of Asparagine (Asn) due to the mutation.
Codon 4: GGG - This codon codes for the amino acid Glycine (Gly).

Now, we can fill in the boxes to represent the new amino acid sequence using the abbreviated form of each amino acid:

1: Met
2: Cys
3: Lys
4: Gly

The new amino acid sequence resulting from the mutation is: Met, Cys, Lys, Gly.