Radio labelled DNA was allowed to replicate twice in a non-radioactive environment. Which of the following is true?
Ans. B. Half of the DNA will have no radioactivity(Ref: Harper 31/e page 363)Semiconservative Nature of DNA Replication proved by Meselson and Stahl states that half of the parent strand is conserved during replication in the daughter strand.After one replication all the DNA will have radioactivity.After two replication half of the DNA will have radioactivity.
All the strands will have radioactivity
Half of the DNA will have no radioactivity
No strands will have radioactivity
Three-fourth of the DNA replicated will have radioactivity
Molecular Genetics