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The known interactions that draw the bases together are not the factor bringing these double helixes close.
Double helixes of DNA keep their bases on their insides. On their outsides, they have highly electrically charged chains of sugars and phosphates, which obscure the forces that pull bases together.
Although it looks as if spooky action or telepathic recognition is going on, DNA operates under the laws of physics, not the supernatural.
To understand what researchers conjecture is really happening, think of double helixes of DNA as corkscrews.
The bases that make up a strand of DNA each cause the corkscrew to bend one way or the other.
Double-stranded DNA with identical sequences each result in corkscrews "whose ridges and grooves match up," said researcher Sergey Leikin, a physical biochemist at the National Institute of Child Health and Human Development in Bethesda, Md.
The electrically charged chains of sugars and phosphates of double helixes of DNA cause the molecules to repel each other.
However, identical DNA double helixes have matching curves, meaning they repel each other the least, Leikin explained.
The scientists conjecture such "telepathy" might help DNA molecules line up properly before they get shuffled around.
Kind of misleading heading