In the experiment conducted by Meselson and Stahl using heavy `.^(15)N` to prove semi-conservative nature of DNA, the first generation was found to have

Options

A. `.^(15)N` only
B. `.^(15)N` only
C. `.^(14)N` and `.^(15)N`
D. None of these

Answer

C

Explanation

`**" "`In the experiment conducted by Meselson by Meselson and Stahl using heavy `.^(15)N` to prove semi-conservative nature of DNA, the first generation was found to have `.^(14)N` and `.^(15)N`.
`**" "`The DNA that was extracted from the culture one generation after the transfer from `.^(15)N` to `.^(14)N` medium [that is after 20 minutes, E. coli divides in 20 minutes] has a hybrid o intermediate density.