Question

In a typical DNA molecule, the proportion of thymine is $20\%$ of the N bases. Find out the percentages of other N bases.

Answer 1

According to the rule given by Chargaff, A + G = C + T.

Adenine (A) will always pair with Thymine (T). This means that A = T.

Cytosine (C) will always pair with Guanine (G). This means that C = G.

Since the proportion of thymine T = 20%, so, A = 20%.

G + C = 100 - 40% = 60%

So, G = 30% and C = 30%.

Therefore, the answer is T = 20%, A = 20%, G = 30% and C = 30%.