An analysis of a DNA (double stranded) sample yielded 18 % cytosine. What would be the percentage of other base ion this sample?

Question

An analysis of a DNA (double stranded) sample yielded 18 % cytosine. What would be the percentage of other base ion this sample? (A) T-32%, A-32%, G-18% (B) T-32%, A-18%, G-32% (C) T-18%, A-32%, G-32% (D) T-40%, A-22%, G-20%

Tardigrade Admin · Accepted Answer

According to Chargaffs rule, in DNA purines and pyrimidines are always in equal proportion (ie, A +G =T +C) and proportion of adenine is always equals to that of thymine, while proportion of guanine always equals to that of cytosine (ie, A = T and G = C). So, option a is correct.

Q. An analysis of a DNA (double stranded) sample yielded $18%$ cytosine. What would be the percentage of other base ion this sample?

T-32%, A-32%, G-18%

T-32%, A-18%, G-32%

T-18%, A-32%, G-32%

T-40%, A-22%, G-20%

According to Chargaffs rule, in DNA purines and pyrimidines are always in equal proportion (ie, $A + G = T + C$ ) and proportion of adenine is always equals to that of thymine, while proportion of guanine always equals to that of cytosine (ie, $A = T$ and $G = C$ ). So, option a is correct.

Q. An analysis of a DNA (double stranded) sample yielded 18% cytosine. What would be the percentage of other base ion this sample?