To Determine Whether DNA Replication Is Semiconservative, Conservative, or Dispersive

question 167

Multiple Choice

To determine whether DNA replication is semiconservative, conservative, or dispersive, Meselson and Stahl labeled E.coli DNA with a regimen of heavy nitrogen for one round of replication and then transferred these cells to a light nitrogen regimen for two more rounds of replication.Which statement would not have been true within the context of this experiment?

• A) If DNA replication was conservative, no DNA molecules of intermediate density would have been seen.
• B) If DNA replication was dispersive, only DNA molecules that were of intermediate density would have been seen.
• C) If DNA replication was semiconservative, the DNA molecules that were made would all be heavy.
• D) If DNA replication was semiconservative, the DNA molecules would consist of one parental strand base paired to one newly replicated strand.
• E) If DNA replication was semiconservative, a higher proportion of DNA molecules from future divisions would have been light.

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