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DNA Structure and Replication

DNA Structure and Replication
The accepted hypothesis for DNA replication is

semi-conservative theory
evolutionary theory
conservative theory
dispersive theory

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DNA Structure and Replication
What bands will be observed in a cesium chloride gradient after two rounds of replication?

One medium band
One light and one medium band
One medium and one heavy band
One light, one medium and one heavy band

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DNA Structure and Replication
DNA gyrase in E. coli

performs the same function as helicase in eukaryotes
adds positive supercoils to chromosomal DNA
is required only at the oriC site
can be inhibited with antibiotics

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DNA Structure and Replication
The packing ratio of nucleosomes is about

9
8
6
7

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DNA Structure and Replication
In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

above DNA containing 14N
with 14N-containing DNA
below DNA containing 14N
all of these

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DNA Structure and Replication
Which enzyme catalyzes the elongation of DNA molecules?

DNA ligase
Primase
Helicase
DNA polymerase

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