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DNA Structure and Replication

DNA Structure and Replication
After one replication in 15N, how many bands should be observed in a cesium chloride gradient?

One
Three
A smear
Two

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

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

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

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

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DNA Structure and Replication
DNA can be sequenced by the

chain termination procedure
physical method
both (a) and (b)
chemical method

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

TFIID
helix-turn-helix
zinc finger
bZIP

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DNA Structure and Replication
What does ligase do during replication of DNA?

Makes copies of mRNA from DNA
Joins nicks in DNA strands
Digests mRNA when it is no longer needed
Synthesizes the lagging strand

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