Biology 251 - Genetics » Spring 2021 » Topic 8.1 Quiz

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Question #1
In the experiment to study DNA replication performed by Meselson and Stahl, DNA was labeled with a radioisotope on:
A.   nitrogen in the bases.
B.   sulfur in the phosphodiester bond.
C.   oxygens in all parts of the nucleotide.
D.   phosophate in the phosphodiester bond.
E.   carbon in the deoxyribose.
Question #2
In the Meselson-Stahl Experiment, incorporation of different isotopes before and after DNA replication could be distinguished by:
A.   an autoradiogram.
B.   gel electrophoresis.
C.   density gradient centrifugation.
D.   affinity chromatography.
Question #3
A model of DNA replication that would keep the original DNA strands together after a round of DNA synthesis is called:
A.   dispersive.
B.   semiconservative.
C.   conservative.
D.   continuous.
Question #4
In the Meselson-Stahl Experiment, it was not possible to distinguish dispersive and semiconservative replication after only one round of replication.
A.   False
B.   True
Question #5
In the Meselson-Stahl Experiment, it was not possible to distinguish convervative and semiconservative replication after only one round of replication.
A.   False
B.   True

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