A centrifuge was used to separate DNA molecules labeled with isotopes of different densities. This experiment revealed a pattern that supports the semiconservative model of DNA replication. FURTHER ...

Great experiments either prove a previous notion, or they reveal unexpected results that lead to new ideas. In science, ideas are propagated and the very best of them survive for many years, if not ...

Frank Stahl, a professor emeritus of molecular biology, doesn’t teach classes at the University anymore, but every intro-level biology student knows him, at least through his work. Stahl was one half ...

He and a colleague proved a theory advanced by the Nobel Prize winners James Watson and Francis Crick, who discovered DNA’s helical structure. By Delthia Ricks Franklin W. Stahl, a molecular biologist ...

Older DNA strands are preferentially sorted into stem cells when they self-renew (A). This segregates the DNA most recently replicated, and therefore most error-prone, into cells destined for ...