Question : There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively

Question : There are 20% adenine among the bases in a DNA fragment mea

1.	Question : There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively
Answer» 52,20,20,40 40,52,40,20 20,40,52,40 40,20,40,52 Solution :`""`3.4 mm length of DNA has = 10 bp `:.` 6.8 mm length of DNA has `=6.8/3.4 xx10` bp `=20` bp `=40` BASES `""`In 40 bases, 20% are adenine, i.e., `40xx20/100=8` adenine base are present `""`According to Chargaff's rule `A=`, so no. of T base is 8. AMONG 40 bases, 16 are `A+T`, so rest 24 would be `G+C`. `G=C` `:.` G and C would be 12 each. `""`A forms 2 H-bonds with T, so there are total 16 H-bonds between 8A and 8T. `**""`G from 3 H-bonds with C, so there are total 36 H-bonds between 12 G and 12 C. Total H-bonds `=16+36=52`.