The genetic information contained in dna consists of a linear sequence of coding units, known as codons. each codon consists of three adjacent dna nucleotides that correspond to a single amino acid in a protein. the e. coli dna molecule contains 4.70×1064.70×106 base pairs. determine the number of codons that can be present in this dna molecule.

The correct answer is 1.57 × 10⁶ codons.

Explanation:

It is given that the number of base pairs in E.coli DNA is 4.70 × 10⁶

1 codon = 3 DNA nucleotide adjacent that codes for a single amino acid

The number of bases or nucleotides in a single strand = number of base pairs in DNA = 4.70 × 10⁶

We only have to consider the coding strands triplet codons, that is,  

Number of triplet codon = 4.70 × 10⁶ / 3

= 1.57 × 10⁶ codons.  

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