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DNA Structure and Replication

DNA Structure and Replication
Which of the following is not a structural motif in DNA binding proteins?

helix-turn-helix
zinc finger
bZIP
TFIID

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DNA Structure and Replication
Enzymes, responsible for unraveling short segments of DNA is

DNA ligase
primase
DNA polymerase
helicase

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
The melting of 40-45 bp at the oriC site of E. coli requires

DNA + ATP + HU + DNAb
DNA + ATP + HU + DNAb + DNAa + Pol III holoenzyme
DNA + ATP + HU
DNA+ ATP + HU + DNAb + DNAa

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

absorption
density
resorption
adhesion

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

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

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