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DNA Structure and Replication

DNA Structure and Replication
What is the exact name of the classical Watson-Crick double helix DNA?

X-DNA
A-DNA
Z-DNA
B-DNA

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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
What does ligase do during replication of DNA?

Joins nicks in DNA strands
Synthesizes the lagging strand
Digests mRNA when it is no longer needed
Makes copies of mRNA from DNA

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DNA Structure and Replication
The packing ratio of nucleosomes is about

7
6
8
9

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DNA Structure and Replication
What is the only common methylation in the DNA of eukaryotes?

None of these
Adenosine in GpA dinucleotides
Guanosine in ApGpA trinucleotides
Cytosine in CpG dinucleotides

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DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

twisting number
linking number
none of these
helix frequency

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