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DNA Structure and Replication

DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

none of these
helix frequency
twisting number
linking number

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DNA Structure and Replication
The replication of a linear DNA molecule in a eukaryotic chromosome creates a problem which is reported to be sorted out by

using enzyme called telomerase
using RNA as a template
None of these
shortening of the double stranded replicated portion

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DNA Structure and Replication
What is the only common methylation in the DNA of eukaryotes?

None of these
Guanosine in ApGpA trinucleotides
Adenosine in GpA dinucleotides
Cytosine in CpG dinucleotides

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DNA Structure and Replication
DNA polymerases I also has

5'-3' endonuclease activity
5'-3' exonuclease activity
both (a) and (b)
3'-5'exonuclease activity

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DNA Structure and Replication
How does ethidium bromide interact with DNA?

It binds to adenine
It binds to phosphate
It intercalates between bases
It does not interact

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DNA Structure and Replication
DNA helicase is used to

break a phosphodiester bond in DNA strand
interact the double helix closely
unwind the double helix
None of these

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