Who used heavy nitrogen $N^{15}$ for proving semiconservative way of $DNA$ replication
Masters and Broda
Meselson and Stahl
Watson and Crick
Jacob and Monad
Ten E.coli cells with ${ }^{15} N$ - dsDNA are incubated in medium containing ${ }^{14} N$ nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from $15\,N$ ?
Which is not correctly matched
During $DNA$ replication which of the following does not act as substrates?
A $DNA$ molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of $DNA$ molecules that contain some radioactive thymidine after three duplications
$DNA$ replication is semi-conservative as