Zoology - Molecular Basis of Inheritance Question with Solution | TestHub

DNA molecule was proven to replicate via semi-conservative method where one of the two strand is a new one and other one is from the parent. When${\mathrm{N}}^{15}$labelled E. coli is grown in medium with${\mathrm{N}}^{14}$, after completion of first round of replication, the new duplicated DNA will have one strand of${\mathrm{N}}^{15}$labelled bases and the new strand having${\mathrm{N}}^{14}$labelled bases. Since, the new DNA is a hybrid its density will be lesser than the parent DNA. The DNA sequence will not differ from parent DNA. Also${\mathrm{N}}^{15}$is heavy but it is not radioactive. Thus neither the parent DNA nor daughter DNA is radioactive.