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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

helicase
DNA polymerase
strandase
none of these

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DNA Structure and Replication
When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?

Uracil
Cytosine
Phosphate
Guanine

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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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DNA Structure and Replication
In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?

Decreases
Increases
Can not be compared
Remains same

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DNA Structure and Replication
Which enzyme catalyzes the elongation of DNA molecules?

DNA ligase
Primase
DNA polymerase
Helicase

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DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

the sedimentation coefficient
comparison with a molecular weight standard such as Hind III digested phage lambda
fluorescence in UV light
the time it takes the gel to run

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