Question

In a famous experiment, Matthew Meselson and Franklin Stahl grew E. coli cells in a medium containing only the "heavy" isotope of nitrogen, 15 N . These cells were then transferred to a medium with the "light" isotope of nitrogen, 14 N . The results of the experiment supported the hypothesis of semiconservative replication, which was proposed by Watson and Crick.

Answer 1

The experiment of Meselson and Stahl test the semi-conservative replication

Step-by-step explanation:

As a context, it can be noted that after the discovery of the double helix by James Watson and Francis Crick, two new theories of DNA replication appeared against the semi-conservative theory that these scientists proposed: on the one hand, the conservative theory was believed, that he postulated that the DNA of the stem cell maintained the two original chains after mitosis; on the other was the scattered theory that held the fragments of the stem cell DNA and synthesized DNA mixed together.

The objective of the experiment of Meselson and Stahl was the discovery of the theories mentioned above was really true. For this, scientists use the E. coli bacteria. They also used the N15 nitrogen isotope. The chemist is one of the fundamental elements of DNA. Thanks to this experiment it was shown that the theory of semi-conservative DNA replication proposed by Watson and Crick was correct.