The process of copying the double-stranded DNA molecule is called replication. Cells must replicate their DNA before dividing, so that each new cell has a complete copy of instructions.
In eukaryotes, the timing of replication in the nucleus is highly regulated.
Semi-conservative Replication
Each double stranded DNA molecule holds the same genetic information.
Therefore each strand can serve as a template for the construction of a new strand. The template (original) strands are separated and preserved, while the new strands are assembled from nucleotides.
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This is called semi-conservative replication, since the each of the two resulting DNA molecules consist of one conserved old strand and one brand new strand. These resulting double-stranded DNA molecules, blended from old and new, are identical to each other.
VIDEO
DNA Structure & Replication
from
Crash Course Biology
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