The building blocks of DNA (the nucleotides) are gotten from inside the nucleus of cells during replication.
Replication is a biological process during which copies of DNA are made in the cells of living organisms.
Double helix DNAs are first unwound and each strand forms a template for the replication of a daughter strand. Complementary nucleotide bases are added to the growing daughter strands until replication is complete.
Nucleotide bases lie freely within the nucleus of living organisms and come in handy during the replication process.
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