Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

How many codons are possible? All of these codons are used in molecules of mRNA and there are only 20 amino acids normally encoded (plus start codons and stop codons). Is there exactly one codon per amino acid, must some codons select for more than one amino acid, or must there be some amino acids for which there is more than one codon?w

Interpretation Introduction


The possible number of codon and the number of codons per amino acids has to be identified.

Concept introduction: In the mRNA molecule the sequence of three bases contain coded information for various amino acid called codon. Each codon consists of three nucleotides.

Codon specify an amino acid. There are three stop codon which implies the end of the protein. Stop codon are UAA,UAG and UGA. AUG is the only start codon which signify the begining of a protein. AUG encodes the amino acid methionine.

Nucleotide consist of three parts: a phosphate group, a ribose sugar and a nitrogenous base.


There are four nucleotide base . Each codon consist of three nucleotide.

So, total number of codon are 4×4×4 = 64.

Some amino acid have more than one codon.

For example, in valine multiple codon are codes for one amino acid, generally these codes are vary at the third base

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