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DNA Structure and Replication

DNA Structure and Replication
What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?

B
S
H
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
Can not be compared
Remains same
Increases

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DNA Structure and Replication
The accepted hypothesis for DNA replication is

conservative theory
evolutionary theory
dispersive theory
semi-conservative theory

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

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DNA Structure and Replication
The melting of 40-45 bp at the oriC site of E. coli requires

DNA+ ATP + HU + DNAb + DNAa
DNA + ATP + HU
DNA + ATP + HU + DNAb
DNA + ATP + HU + DNAb + DNAa + Pol III holoenzyme

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DNA Structure and Replication
DNA polymerases I also has

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

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