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DNA Structure and Replication

DNA Structure and Replication
Which histone(s) are associated with the linker DNA of a nucleosome?

Histone H4
Histone H3
Histone H1
Histones H2A and H2B

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DNA Structure and Replication
An RNA primer is synthesized by

DNA topoisomerase
DNA helicases
primase
ligase

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

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

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

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

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

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

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DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

the ratio of Adenine to thymine was always the same
proteins and DNA were responsible for heredity
phage DNA was similar to bacterial DNA
DNA was responsible for heredity

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