So for example, if there's a G on one side of the strand, there will always be a C on the other. If there's a T on one side of the strand, there will always be an A on the other. And those nucleotides always pair.
We also count DNA and the amount of DNA, or the length of DNA by using units of base pairs, so if we're discussing a gene and we want to describe how big is a gene, we might say that the gene is a thousand base pairs long.
If it's a really big gene, it may be 10, base pairs, or essentially 10 kilobases long. For them to bond with each other would be chemically unfavorable. Why does adenine pair with thymine and not cytosine? Feb 11, The chemical structure of the molecules determine what they are most likely to pair with. I hope that helps! Related questions How do I determine the molecular shape of a molecule?
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