Question

A geneticist studying skin pigmentation in zebra fish isolated and sequenced a gene which he believed encoded a blue pigment . The geneticist identified the promoter region of the gene and discovered that the gene carried a 55 base pair untranslated leader sequence and a 34 base pair untranslated trailer sequence. He also analyzed the coding sequence of the gene and discovered that the primary structure of the protein encoded is as follows:

met-ile-phe-leu-leu-ile-val-val-ala-pro-thr-ser-ser-pro-arg-ser-gly-trp-cys-arg-leu-met-arg-ser-leu-met-cys

How many nucleotides would you expect to find in the final mRNA transcript encoded by the gene?

27

91

84

81

173

173

Answer 1

Ans- protein contains 27 amino acids.

Each amino acids encode by three nucleotide sequence

Than number of nucleotide in mRNA= 27×3= 81

81 expected nucleotide in final mRNA transcript, encoded by this gene.

So correct option is 81