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DNA Structure and Replication

DNA Structure and Replication
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

purines
pyrimidines
All of these
protamines

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DNA Structure and Replication
There is a single origin for DNA replication in bacteria. How many origins of replication are found in the much larger genomes of eukaryotes such as mammals?

About 100
One
Thousands and tens of thousands
none of these

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DNA Structure and Replication
Klenow fragment without free nucleotides exhibits

no activity
exonuclease activity
endonuclease activity
nickase activity

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

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

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

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DNA Structure and Replication
Proteins which help to open the double helix for DNA synthesis are

single stranded binding proteins
DNA topoisomerase
ligase
DNA helicases

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