In the DNA molecule, the number of nucleotides with thymine is 20% of the total. What is the percentage of nucleotides with cytosine in this molecule?

This task is solved according to the Chargeff rule: since guanine-cytosine, thymine-adenine, and their amount in a normal molecule are located according to the DNA complementarity rule
(A + T) + (G + C) = 100%.
Hence, if T = 20%, then
A = T = 20%;
G = C = (100% – (20% + 20%)) / 2 = 30%.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.