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DNA Structure and Replication

DNA Structure and Replication
If one cell has AT contents 40%, what will be the percentage of Guanine residue?

60%
30%
15%
Guanine residue can not be calculated

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DNA Structure and Replication
E.coli DNA polymerases II and III lack

5' → 3' endonuclease activity
5' → 3' exonuclease activity
partially 5' → 3' exonuclease activity
partially 5' → 3' endonuclease activity

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DNA Structure and Replication
The DNA polymerase in bacteria, responsible for DNA synthesis is

Polymerase I
Polymerase III
Polymerase II
all of these

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DNA Structure and Replication
DNA helicase is used to

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

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

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

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

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

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