Question

First experimental proof for semi-conservative
replication was shown in
(a) Streptococcus pneumoniae
(b) Escherichia coli
(c) Neurospora crassa
(d) Rattus rattus.​

Answer 1

Answer:

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$\large\underline\blue{\tt Ur\:Answer \:is\:(b)}$

Mathew Meselson and Franklin Stahl Conducted various experiment using labelled DNA of E.coli to provide evidence in favor of semi-conservative mode of DNA replication.

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Answer 2

Answer: it's b

Escherichia coli bacteria

Explanation:

The experimental proof for semiconservative replication of DNA was conducted by Meselson and Stahl on E.coli Bacteria. The bacteria were exposed to an environment of a heavy isotope of Nitrogen. They continued this for fourteen generations. They observed that the DNA of the bacteria had not just the 14 N nitrogen (as is naturally present0 but the isotope from the medium as well. Thus, proving the semiconservative replication theory.