Zoology - Molecular Basis of Inheritance Question with Solution | TestHub

Meselson and Stahl first proved the semi -conservative replication of DNA in E.coli. Later on it was also

proved in plant and animal cells. E. coli divides in every 20 minutes. It means that DNA in E.coli replicates

in every 20 minutes.${ }^{15}\mathrm{N}$is the heavy isotope (not a radioactive isotope) of the nitrogen which can be

distinguished from the normal nitrogen (${ }^{14}\mathrm{N}$).

DNA with${ }^{15}\mathrm{N}$- Heavy DNA.

DNA with${ }^{14}\mathrm{N}$- Light DNA.

DNA with${ }^{15}\mathrm{N}$can be distinguished from the DNA with${ }^{14}\mathrm{N}$by centrifugation in a CsCl (cesium chloride)

density gradient.