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DNA Structure and Replication

DNA Structure and Replication
After one replication in 15N, how many bands should be observed in a cesium chloride gradient?

One
A smear
Three
Two

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DNA Structure and Replication
DNA gyrase in E. coli

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

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DNA Structure and Replication
Telomeres are usually rich in which nucleotide?

Guanine
Cytosine
Thymine
Adenine

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DNA Structure and Replication
The chromosomal DNA complexes with

five types of histone as H1, H2A, H2B, H3 and H4
three types of histone as H1, H2A and H4
four types of histone as H1, H2A, H3 and H4
two types of histone as H1 and H4

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

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

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

linking number
twisting number
helix frequency
none of these

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