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DNA Structure and Replication

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

strandase
DNA polymerase
helicase
none of these

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

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

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

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

Bleomycin
All of these
Erythromycin
Tunicamycin

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DNA Structure and Replication
What bands will be observed in a cesium chloride gradient after two rounds of replication?

One light and one medium band
One light, one medium and one heavy band
One medium band
One medium and one heavy band

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DNA Structure and Replication
Which is the largest among the followings?

Carbon
Nucleotide
Nitrogenous base
Phosphate

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