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DNA Structure and Replication

DNA Structure and Replication
After one replication in 15N, how many bands should be observed in a cesium chloride gradient?

One
Two
A smear
Three

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DNA Structure and Replication
Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

3' → 5' exonuclease
5' → 3' exonuclease
All of these
5' → 3' polymerase

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DNA Structure and Replication
The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

strandase
helicase
DNA polymerase
none of these

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

Strongylocentrotus purpuratus
Arabidopsis thaliana
Xenopus laevis
Saccharomyces cerevisiae

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DNA Structure and Replication
Which of the following enzyme adds complementary bases during replication?

Replicase
Synthesase
Polymerase
Helicase

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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?

Thousands and tens of thousands
none of these
One
About 100

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