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DNA Structure and Replication

DNA Structure and Replication
Deoxyribonucleoside triphosphates, being need in the chain termination methods are

dATP
dGTP and dCTP
dTTP
all of these

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

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

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DNA Structure and Replication
What is the range of melting point temperatures (Tm) for most DNA molecules?

70 to 90°C
50 to 60°C
80 to l00°C
60 to 80°C

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DNA Structure and Replication
DNA replication takes place in which direction?

Vary from organism to organism
5 'to 3'
Randomly
3' to 5'

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

helicase
DNA polymerase
none of these
strandase

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

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

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