You are doing an experiment where you are replicating DNA and new nucleotides are lighter than the original nucleotides. You keep double helices of DNA together. After one round of replication (doubling the number of helices) you would expect
a. a range of weights from heavy to light.
b. all double helices to weigh the same, all light.
c. half of the double helices to be heavy and half to be light.
d. all double helices to weigh the same, half way between heavy and light.
