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DNA Structure and Replication

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

restriction endonuclease
transposase
helicase
reverse transcriptase

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
Enzyme, responsible for proofreading base pairing is

Primase
DNA ligase
Telomerase
DNA polymerase

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DNA Structure and Replication
The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

helicase
strandase
DNA polymerase
none of these

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DNA Structure and Replication
In an agarose gel, DNA is moving from

left to right
cathode to anode
anode to cathode
A to B

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DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

fluorescence in UV light
the time it takes the gel to run
comparison with a molecular weight standard such as Hind III digested phage lambda
the sedimentation coefficient

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