Assume that two strands of dna have been separated and that the base sequence on one strand is atgc. state the sequence of bases on the second strand.

The answer is tacg. This is because adenine pairs with thymine while cytosine pairs with guanine. We know that the strands of the double helix are antiparallel to each other and that this purine-pyrimidine pair is the reason why the DNA is of consistent width throughout its length.