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DNA Structure and Replication

DNA Structure and Replication
What is the exact name of the classical Watson-Crick double helix DNA?

A-DNA
X-DNA
B-DNA
Z-DNA

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

Strongylocentrotus purpuratus
Saccharomyces cerevisiae
Xenopus laevis
Arabidopsis thaliana

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DNA Structure and Replication
DNA replication in eukaryotes occurs only in

M phase
S phase
G2 phase
G1 phase

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DNA Structure and Replication
DNA polymerases I also has

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

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DNA Structure and Replication
In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

above DNA containing 14N
with 14N-containing DNA
all of these
below DNA containing 14N

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DNA Structure and Replication
DNA gyrase in E. coli

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

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