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DNA Structure and Replication

DNA Structure and Replication
Which polymerase is active in DNA repairing

Polymerase I
Polymerase III
none of these
Polymerase II

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

Histone H1
Histone H4
Histones H2A and H2B
Histone H3

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DNA Structure and Replication
DNA gyrase in E. coli

performs the same function as helicase in eukaryotes
adds positive supercoils to chromosomal DNA
can be inhibited with antibiotics
is required only at the oriC site

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

pyrimidines
purines
protamines
All 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?

Phosphate
Cytosine
Guanine
Uracil

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

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

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