143 Escherichia coli cells were grown for many generations

Last updated: 6/21/2023

143 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 a 1 0 7 Relative amounts n b 1 1 6 c 0 1 7 d 0 8 0