1. Tardigrade
  2. Question
  3. Biology
  4. Escherichia coli cells were grown for many generations in 15NH4Cl as sole nitrogen source. Subsequently, these cells were grown exactly for four generations in medium containing 14NH4CI. The DNA from these cells were isolated and separeted. If 15N/15N represents the two strands of DNA where both strands have heavy nitrogen; 15N/14N as intermediate DNA; and 14N / 14N as DNA containing light nitrogen, the ratios for heavy: intermediate: light DNA, respectively would be

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Escherichia coli cells were grown for many generations in $^{15}NH_{4}Cl$ as sole nitrogen source. Subsequently, these cells were grown exactly for four generations in medium containing $^{14}NH_{4}CI$. The $DNA$ from these cells were isolated and separeted. If $^{15}N/^{15}N$ represents the two strands of $DNA$ where both strands have heavy nitrogen; $^{15}N/^{14}N$ as intermediate $DNA$; and $^{14}N / ^{14}N$ as $DNA$ containing light nitrogen, the ratios for heavy: intermediate: light $DNA$, respectively would be

Molecular Basis of Inheritance

Solution:

Correct answer is (c) $0 : 1 : 7$