During DNA replication, the original DNA strand "unzips" or splits where the two bases join together to form the rungs of the DNA ladder. There are four nitrogenous bases, cytosine, thymine, adenine and guanine. The sides of the unzipped DNA serve as a template for which other nitrogenous bases may be paired to make new strands of DNA. The pairing goes like this: adenine pairs to thymine, while guanine pairs to cytosine. I teach my students to remember the word "AT", since adenine pairs to thymine. That leaves guanine to pair to cytosine. The correct pairing for this DNA sequence , then, would be GATCCA. Guanine would pair to cytosine, adenine to thymine, thymine to adenine. Cytosine would pair to guanine, cytosine to guanine, and adenine to thymine.
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