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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
none of these
strandase

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DNA Structure and Replication
Proteins involved in opening a replication bubble are

ligase
DNA helicases
DNA topoisomerase
single stranded binding proteins

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DNA Structure and Replication
Which of the following species lack a 'classical' histone H1?

Arabidopsis thaliana
Strongylocentrotus purpuratus
Saccharomyces cerevisiae
Xenopus laevis

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

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

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DNA Structure and Replication
The DNA is negatively super coiled, complexes to histone,

HSP-1
H-NS
All of these
HU

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DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

covalent bonds between the pair of bases
ionic bonds between the pair of bases
hydrogen bonds between the pair of bases
None of these

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