First slide

Genetic Code

Question

Calculate the number of hydrogen bonds in DNA with 40 Cytosines, which transcribes mRNA with 45 codons.

Easy

Solution

mRNA= 45 codons= 45 X 3= 135 nucleotides
No. of nucleotides in DNA= 135 X 2= 270
No. of cytosine= 40= No. of Guanine
Total (G+C) = 80
Total no. of (A+T) = 270-80= 190
No. of A=190/2= 95= No. of T
Total no. of hydrogen bonds= (95 X 2) + (40 X 3) = 310

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