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DNA Structure and Replication

DNA Structure and Replication
A cesium chloride will separate DNA molecules by

adhesion
density
resorption
absorption

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

DNA ligase
DNA polymerase
primase
helicase

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DNA Structure and Replication
For the DNA replication in eukaryotes, the cell cycle consists of

G1,S, G2 and M phases
G1, G2 and M phases
S, G2 and M phases
G2 and M phases

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
In DNA replication, one new strand is synthesized complementary to an old (parent) strand and is referred as

mutational
semiconservative
discontinuous
antiparallel

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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
none of these
Thousands and tens of thousands
About 100

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