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DNA Replication
* Double-helix (twisted ladder)
deoxyribose alternating with phosphates make up sides
nitrogen molecules make up rungs
* Guanine matches up with cytosine
* Adenine matches up with thymine
DNA molecule separates like a zipper
Nitrogen bases floating in nucleus pair up with bases of each half to
make two new DNA molecules
Because of the way nitrogen bases pair up, each DNA molecule exactly
matches the order of the original.