If a polypeptide chain has 66 amino acids then what is the number of nucleotides on mRNA?

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198

201

132

answer is B.

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Detailed Solution

The number of nucleotides on mRNA that would code for a polypeptide chain with 66 amino acids depends on the genetic code, which specifies the relationship between nucleotides and amino acids.

Each amino acid is coded for by a sequence of three nucleotides called a codon. Therefore, the number of nucleotides on mRNA that would code for a polypeptide chain with 66 amino acids would be:

66 amino acids × 3 nucleotides/codon = 198 nucleotides

Now there is one stop codon as well which will not code for any amino acid but will be present in the translation unit.

Therefore, total no. of nucleotides = 198+3= 201

We can also use the formula (3n+3), where n is the number of amino acids.

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