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DNA Structure and Replication

DNA Structure and Replication
Enzymes, responsible for unraveling short segments of DNA is

helicase
DNA polymerase
primase
DNA ligase

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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?

Semi-conservative theory
Evolutionary theory
Conservative theory
Dispersive theory

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

Synthesase
Helicase
Polymerase
Replicase

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DNA Structure and Replication
Which polymerase is active in DNA repairing

Polymerase II
none of these
Polymerase III
Polymerase I

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DNA Structure and Replication
DNA gyrase in E. coli

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

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

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

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