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DNA Structure and Replication

DNA Structure and Replication
The nicks or gaps between Okazaki fragments are eventually sealed by

gyrase
DNA ligase
polymerase
RNA ligase

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DNA Structure and Replication
Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

3' → 5' exonuclease
All of these
5' → 3' polymerase
5' → 3' exonuclease

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DNA Structure and Replication
Okazaki fragments occur on the __________ and are bonded together by __________

Leading strand, polymerase
Lagging strand, ligase
mRNA, anticodons
tRNA, polymerase

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DNA Structure and Replication
The melting of 40-45 bp at the oriC site of E. coli requires

DNA+ ATP + HU + DNAb + DNAa
DNA + ATP + HU + DNAb
DNA + ATP + HU
DNA + ATP + HU + DNAb + DNAa + Pol III holoenzyme

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DNA Structure and Replication
Which of the following is not a structural motif in DNA binding proteins?

TFIID
bZIP
zinc finger
helix-turn-helix

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DNA Structure and Replication
What is the main damaging effect of UV radiation on DNA?

Depurination
Single strand break
Formation of thymine dimers
Dehydration

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