KVPY SX SB Exam 2015 Question Paper

Question : 72 of 120

Marks: +1, -0

If molecular weight of a polypeptide is 15.3 kDa, what would be the minimum number of nucleotides in the mRNA that codes for this polypeptide? Assume that molecular weight of each amino acid is 90 Da.

Validate

Solution:

Molecular weight of polypeptide = 15.3 kda
Molecular weight of amino acid = 90 Da
∴ No. of Amino acid in polypeptide =

{15.3×10^3}/90=170

∵ One amino acid is coded by = 3 Nitrogen base
∴ 170 amino acid would be coded by = 170 × 3 = 510 Nitrogen base

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