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DNA Structure and Replication

DNA Structure and Replication
Which enzyme catalyzes the elongation of DNA molecules?

DNA ligase
Helicase
Primase
DNA polymerase

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DNA Structure and Replication
Each replication bubbles consists of

4 replication forks
1 replication forks
2 replication forks
3 replication forks

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

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

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DNA Structure and Replication
The accepted hypothesis for DNA replication is

evolutionary theory
dispersive theory
semi-conservative theory
conservative theory

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DNA Structure and Replication
DNA helicase is used to

break a phosphodiester bond in DNA strand
interact the double helix closely
None of these
unwind the double helix

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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?

One
About 100
none of these
Thousands and tens of thousands

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