Assuming this is regarding DNA replication or transcription, the enzyme helicase separates the two strands.
helicase enzyme
It is called Dna replication.
C=G G=C A=U T=A Switch them around for when you are converting RNA to DNA.
Hydrogen bonding infers that the two strands are VERY close together so the strands are practically right next to each other. As the strands wind up in a larger scale they wrap around proteins to...