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DNA Structure and Replication

DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

none of these
helix frequency
linking number
twisting number

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DNA Structure and Replication
An enzyme that recognizes foreign DNA, and results in a cut in that DNA is called

restriction endonuclease
helicase
reverse transcriptase
transposase

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DNA Structure and Replication
The site on a bacterial chromosome that marks the initiation point for chromosome replication is called

an initiation codon
Pro
Ori
a promoter

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DNA Structure and Replication
Who's X-ray work aided Watson and Crick in their discovery of the double helix?

Leaderberg
R. Franklin
L. Pauling
W.H. Bragg

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

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DNA Structure and Replication
DNA gyrase in E. coli

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

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