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DNA Structure and Replication

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

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

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DNA Structure and Replication
Which polymerase is active in DNA repairing

none of these
Polymerase II
Polymerase I
Polymerase III

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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

protamines
All of these
pyrimidines
purines

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

primase
DNA polymerase
helicase
DNA ligase

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

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

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DNA Structure and Replication
The role of primase is to

cleave and unwinds short sections of DNA ahead of the replication fork
dismantle RNA primer
proofread base pairing
synthesize an RNA primer to begin the elongation process

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