Question

A part of the template strand of a DNA molecule that codes for the 5’ end of an mRNA has the sequence 3’-TTTTACCGGAATTAGAGTCGCAGGATG-5’. What is the amino acid sequence of the polypeptide encoded by this region, assuming that the normal start codon is needed for initiation of polypeptide synthesis?

Answer 1

Met-Phe-Cys-Gln-Thr-Leu-Gln-Gly-Met-Arg.

Step-by-step explanation:

Using the genetic code which involves 64 codons coding for the 20 amino acids, the amino acid sequence of the mRNA sequence can be determined. A three nucleotide codon in a nucleic acid sequence specifies an amino acid thus we will have: the start codon coding for methionine:

Met-Phe-Cys-Gln-Thr-Leu-Gln-Gly-Met-Arg.