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DNA Structure and Replication

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

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

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DNA Structure and Replication
Which histone(s) are associated with the linker DNA of a nucleosome?

Histone H1
Histone H4
Histone H3
Histones H2A and H2B

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DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

DNAb, gyrase
DNAb, DNA polymerase
DNAa, gyrase
Single stranded protein, DNAa

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DNA Structure and Replication
The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

strandase
none of these
helicase
DNA polymerase

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DNA Structure and Replication
Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals?

All of these
Bleomycin
Erythromycin
Tunicamycin

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

All of these
HU
HSP-1
H-NS

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