Arrange the following events of Meselson and Stahl's experiment in order of their occurrence:
A. DNA extracted from the culture, twenty minutes after transfer from 15N to 14N medium had a hybrid density.
B. E. coli with heavy DNA were transferred into a medium with 14NH4Cl.
C. E. coli were grown in a medium containing 15NH4Cl.
D. DNA extracted from the culture after forty minutes had equal amounts of hybrid DNA and light DNA.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → C, B, A, D
E. coli were grown in 15NH4Cl (C), moved to 14NH4Cl (B); after twenty minutes the DNA was hybrid (A); after forty minutes there were equal amounts of hybrid and light DNA (D).