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DNA Structure and Replication

DNA Structure and Replication
Proteins which help to open the double helix for DNA synthesis are

DNA helicases
single stranded binding proteins
ligase
DNA topoisomerase

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DNA Structure and Replication
Which will require a higher temperature to denature?

RNA with a high G-C content
RNA with a high A-T content
DNA with a high G-C content
DNA with a high A-T content

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DNA Structure and Replication
Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals?

Erythromycin
All of these
Bleomycin
Tunicamycin

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

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

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

zinc finger
TFIID
helix-turn-helix
bZIP

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DNA Structure and Replication
DNA gyrase in E. coli

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

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