The Meselson-Stahl experiment used nitrogen isotopes to show new DNA has one old strand and one new strand—semiconservative. But studying it now, with loan papers for my engineering son piled next to my books, I see differently. Replication feels *conservative*: my old life is entirely for my boys’ future, nothing saved for the original strand. Every early morning delivery run before class proves that.
#exams#study
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