PrintCalcuiator Periodic Table Question 3 of 39 Lehninger Principles of Biochemi

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PrintCalcuiator Periodic Table Question 3 of 39 Lehninger Principles of Biochemistry Nelson | Cox MHE/Freeman by Sapling Leaming Map da ENT genetic information contained in DNA consists of a linear sequence of coding units, known as codons codon consists of three adjacent DNA nucleotides that correspond to a single amino acid in a protein. The E. coli DNA molecule contains 4.7 × 106 base pairs. Determine the number of codons that can be present in this DNA molecule. Number codons Assuming that the average protein in E. coli consists of a chain of 420 amino acids, calculate the maximum number of proteins that can be coded by an E. coli DNA molecule. Number proteins Previous Give Up & View Solution Check Answer Next Exit

Explanation / Answer

1. The genetic code is a triplet. Each codon contains three nucleotides.

Number of bases = 4.7 X 10^6

Number of codons = (4.7 X 10^6)/3

= 1.5666 X 10^6 codons

2. The average length of a protein = 420 amino acids

1 codon = 1 amino acid

Number of proteins = (1.5666 X 10^6)/420

= 3730 proteins

However, the identified number of proteins in E coli = 1147.

This is due to the fact that the entire genome does not code for proteins.

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