What was the medium used for growing E. coli in the first part of the experiment?

What was the medium used for growing E. coli in the first part of the experiment?
  1. Normal 14NH₄Cl
  2. 15NH₄Cl
  3. CsCl density gradient
  4. None of the above

Solution

In the first part of the experiment, E. coli was grown in a medium containing 15NH₄Cl as the only nitrogen source. The incorporation of 15N into the newly synthesized DNA allowed the researchers to distinguish it from the parental DNA.

Asked in: NCERT

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