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DNA Molecule is being compared to a ZIPPER because DNA comprises of 2 lines that interlock with each other just like how zipper works when you close it.
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DNA has two "strands" which in the zipper analogy serve as two sides of your zipper.
in the middle  extending toward each other are base just like a "teeth of a zipper the bases  of one strand stick to the bases on a another strand...
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