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Watson–Crick Model and DNA Replication

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Questions and Answers

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?

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?

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?

15N Signup and view all the answers

Why did bacteria grown in heavy 15N medium have denser DNA than bacteria grown in 14N medium?

Due to the incorporation of the heavy 15N isotope into the bases of DNA Signup and view all the answers

What does the Watson-Crick model suggest about copying genetic information?

Complementarity is the basis for copying genetic information. Signup and view all the answers

In which DNA replication model do both daughter strands contain all-new molecules?

Conservative model Signup and view all the answers

How are the daughter duplexes formed in the semiconservative model?

Each daughter duplex consists of one parental strand and one newly synthesized strand. Signup and view all the answers

What characterizes the dispersive model of DNA replication?

New DNA consists of mixtures of parental and newly synthesized strands. Signup and view all the answers

What happens to the parental helix in the conservative DNA replication model?

Remains intact Signup and view all the answers