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

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DNA Structure and Replication
There is a single origin for DNA replication in bacteria. How many origins of replication are found in the much larger genomes of eukaryotes such as mammals?

One
none of these
Thousands and tens of thousands
About 100

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DNA Structure and Replication
What is the name given to the points at which a DNA helix is unwound and new strands develop?

Leading strands
Replication forks
Replication origins
Okazaki fragments

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
Proteins involved in opening a replication bubble are

ligase
DNA helicases
DNA topoisomerase
single stranded binding proteins

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DNA Structure and Replication
Messelsen and Stahl model of replication was called

conservative replication
Cri du Chat
semi-conservative replication
dispersive replication

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