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DNA's structure is likened to a zipper due to its double-helical shape and base pairing, resembling the opening and closing of a zip during replication.
The structure of a DNA molecule is often described as a zipper because of its double-helical shape, resembling a twisted ladder where the two strands are held together by weak hydrogen bonds, like a closed zip.
The DNA molecule consists of nucleotides with a sugar-phosphate backbone and nitrogen bases that pair up: adenine with thymine, guanine with cytosine.
During replication, the DNA strands unwind, and new complementary strands are formed based on the base pairing rules, similar to opening and closing a zipper.
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