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Chapter 13: Problem 7

How many different sequences of mRNA could encode a peptide with the sequence proline-glycine-methionine-serine?

Short Answer

Expert verified
The total number of distinct mRNA sequences that can encode the peptide sequence proline-glycine-methionine-serine is 96.

Step by step solution

01

Find the number of Codons for each Amino Acid

From the genetic code, determine the number of distinct codons for each amino acid. \n\nProline (Pro) has 4 codons, Glycine (Gly) has 4 codons, Methionine (Met) has only 1 codon and Serine (Ser) has 6 codons.
02

Apply the Multiplication Principle

Since each amino acid in the sequence can be independently coded by one of its codons, apply the multiplication rule for counting. The multiplication principle states that if there are m possible codons for one amino acid and n possible codons for another, then there are m*n possible mRNA sequences for the combination of these two amino acids.
03

Calculate the number of mRNA sequences

Calculate the total possible mRNA sequences coding the peptide with the sequence proline-glycine-methionine-serine. By multiplying the number of codons which can encode each respective amino acid: \(4 * 4 * 1 * 6\) we get the total number of possible sequences.

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Most popular questions from this chapter

An mRNA has the following sequence: 5'-GGCGAUGGGCAAUAAACCGGGCCAGUAAGC-3' Identify the start codon, and determine the complete amino acid sequence that would be translated from this mRNA.

Explain the functional roles of the A, P, and E sites during translation.

A tRNA has an anticodon sequence \(3^{\prime}-\mathrm{GGU}-5^{\prime}\). What amino acid does it carry?

Explain what is meant by the coupling of transcription and translation in bacteria. Does coupling occur in bacterial and/or eukaryotic cells? Explain.

If a tRNA molecule carries a glutamic acid, what are the two possible anticodon sequences that it could contain? Be specific about the \(5^{\prime}\) and \(3^{\prime}\) ends.
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