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DNA Structure and Replication

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

DNA ligase
Helicase
DNA polymerase
Primase

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DNA Structure and Replication
One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Dispersive theory
Semi-conservative theory
Conservative theory
Evolutionary theory

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DNA Structure and Replication
DNA helicase is used to

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

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DNA Structure and Replication
Which will require a higher temperature to denature?

DNA with a high A-T content
DNA with a high G-C content
RNA with a high G-C content
RNA with a high A-T content

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

A smear
One
Three
Two

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DNA Structure and Replication
What bands will be observed in a cesium chloride gradient after two rounds of replication?

One light and one medium band
One medium band
One light, one medium and one heavy band
One medium and one heavy band

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