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DNA Structure and Replication

DNA Structure and Replication
The DNA is negatively super coiled, complexes to histone,

HSP-1
All of these
HU
H-NS

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

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

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DNA Structure and Replication
What is the main damaging effect of UV radiation on DNA?

Dehydration
Depurination
Single strand break
Formation of thymine dimers

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DNA Structure and Replication
Messelsen and Stahl model of replication was called

Cri du Chat
conservative replication
dispersive replication
semi-conservative replication

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DNA Structure and Replication
One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Conservative theory
Dispersive theory
Semi-conservative theory
Evolutionary theory

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DNA Structure and Replication
DNA replication takes place in which direction?

3' to 5'
5 'to 3'
Randomly
Vary from organism to organism

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