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DNA Structure and Replication

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

HU
All of these
H-NS
HSP-1

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

Dehydration
Formation of thymine dimers
Depurination
Single strand break

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DNA Structure and Replication
The RNA primers used to initiate replication in E. coli

are removed by Pol I
are joined together by DNA ligase
are removed by helicase + ATP
result in Okazaki fragments on leading strand

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DNA Structure and Replication
What is the approximate percentage of repetitive DNA sequences in human DNA?

20 to 30%
30 to 40%
10 to 20%
40 to 50%

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DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

ionic bonds between the pair of bases
None of these
hydrogen bonds between the pair of bases
covalent bonds between the pair of bases

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DNA Structure and Replication
Which will require a higher temperature to denature?

DNA with a high A-T content
DNA with a high G-C content
RNA with a high A-T content
RNA with a high G-C content

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