The mentioned double-stranded DNA has 80 thymine nucleotides. This means that this DNA duplex has a total of 80 adenine bases. Since thymine pairs with adenine, the number of thymine and adenine is equal in a double-stranded DNA. Similarly, the presence of a total of 110 guanine nucleotides in the DNA indicates the fact that it has a total of 110 cytosine nucleotides. So, total number of nucleotides in this DNA double helix would be= 80 A + 80 T + 110 G + 110 C= 80 + 80 + 110 + 110 = 380.
