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Questions and Answers
What does the semiconservative model of DNA replication produce?
What does the semiconservative model of DNA replication produce?
- Two hybrid molecules of old and new strands (correct)
- Molecules with one completely old strand and one completely new strand
- Molecules with each strand a mixture of old and new
- Hybrid molecules with both strands being completely new
Why was ultracentrifugation used in the Meselson–Stahl experiment?
Why was ultracentrifugation used in the Meselson–Stahl experiment?
- To label DNA
- To separate molecules with different densities (correct)
- To measure DNA replication rates
- To analyze DNA sequence variations
What would be the outcome of a third round of replication in the Meselson–Stahl experiment?
What would be the outcome of a third round of replication in the Meselson–Stahl experiment?
- The light 14N band would be darker due to hybrid molecules producing one hybrid and one all-14N molecule (correct)
- There would be no change in band patterns
- The light 14N band would disappear completely
- Only heavy 15N bands would be visible
What was the heavier isotope of nitrogen used by Meselson and Stahl in their experiment?
What was the heavier isotope of nitrogen used by Meselson and Stahl in their experiment?
Why did bacteria grown in heavy 15N medium have denser DNA than bacteria grown in 14N medium?
Why did bacteria grown in heavy 15N medium have denser DNA than bacteria grown in 14N medium?
What does the Watson-Crick model suggest about copying genetic information?
What does the Watson-Crick model suggest about copying genetic information?
In which DNA replication model do both daughter strands contain all-new molecules?
In which DNA replication model do both daughter strands contain all-new molecules?
How are the daughter duplexes formed in the semiconservative model?
How are the daughter duplexes formed in the semiconservative model?
What characterizes the dispersive model of DNA replication?
What characterizes the dispersive model of DNA replication?
What happens to the parental helix in the conservative DNA replication model?
What happens to the parental helix in the conservative DNA replication model?
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