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DNA Structure and Replication

DNA Structure and Replication
A cesium chloride will separate DNA molecules by

resorption
adhesion
absorption
density

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DNA Structure and Replication
For the DNA replication in eukaryotes, the cell cycle consists of

G2 and M phases
G1,S, G2 and M phases
S, G2 and M phases
G1, G2 and M phases

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
The replication of a linear DNA molecule in a eukaryotic chromosome creates a problem which is reported to be sorted out by

using RNA as a template
using enzyme called telomerase
None of these
shortening of the double stranded replicated portion

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

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

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DNA Structure and Replication
What is the approximate size (in kb) of the E. coli genome?

3000 kilobase
4500 kilobase
6500 kilobase
5500 kilobase

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