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DNA Structure and Replication

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

Helicase
Primase
DNA ligase
DNA polymerase

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DNA Structure and Replication
Replication in E. coli is initiated by the generation of short RNA primers using

both (a) and (b)
reverse transcriptase
RNA polymerase
primase

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DNA Structure and Replication
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

pyrimidines
protamines
purines
All of these

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

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

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DNA Structure and Replication
In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

all of these
below DNA containing 14N
above DNA containing 14N
with 14N-containing DNA

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DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

DNAb, DNA polymerase
DNAa, gyrase
DNAb, gyrase
Single stranded protein, DNAa

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