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Every second of every day, your body performs a microscopic miracle of duplication. Before a single cell can divide, it must make an exact copy of its DNA, the master instruction manual of life. This elegant process is called DNA replication, and it relies on a highly coordinated team of molecular machines.
The process begins with unzipping. The double helix of DNA is tightly wound, so an enzyme called helicase slices through the hydrogen bonds holding the two complementary strands together. This creates a Y-shaped structure known as the replication fork, exposing the genetic template.
Next comes the building phase, but the primary construction worker, an enzyme called DNA polymerase, cannot start from scratch. It needs a starting block. An enzyme called primase lays down a short temporary stretch of RNA called a primer. Once this anchor is in place, DNA polymerase binds and begins adding complementary bases, matching adenine with thymine, and cytosine with guanine.
Because DNA strands run in opposite directions, the copying happens differently on each side. On the leading strand, DNA polymerase moves smoothly and continuously. On the lagging strand, however, the enzyme must work backward in short, disjointed spurts, creating segments called Okazaki fragments.
Finally, another enzyme called ligase acts as glue, sealing the fragments on the lagging strand into a continuous ribbon. Meanwhile, DNA polymerase double-checks its work, correcting any typos to prevent mutations. The result of this incredible choreography is two identical DNA molecules, each containing one original strand and one brand-new strand, ready to guide the next generation of cells.
