Why is the structure of dna called a double helix?
a.because dna is made of two strands of nucleotides wound together in a spiral.
b.because the number of copies of dna doubles with each round of pcr
c.because two copies of dna are inherited, one each from the mother and father
d.because each of the curved dna subunits appears twice whenever it appears submit for grading save and finish later?