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DNA: Definition, Structure & More


The bases on one strand pair with the bases on another strand: adenine pairs with thymine, and guanine pairs with cytosine.


DNA molecules are long — so long, in fact, that they can’t fit into cells without the right packaging. To fit inside cells, DNA is coiled tightly to form structures we call chromosomes. Each chromosome contains a single DNA molecule. Humans have 23 pairs of chromosomes, which are found inside the cell’s nucleus.


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