Question: Which force is most responsible for keeping the two strands of the DNA double helix together? repulsion between phosphate backbones of each strand hydrogen bonding

Which force is most responsible for keeping the two strands of the DNA double helix together?
repulsion between phosphate backbones of each strand
hydrogen bonding between ribose sugar molecules in each nucleotide
hydrogen bonding between the bases in one strand and the bases in the other
London forces between the aromatic rings in each base of a strand
Which force is most responsible for keeping the

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