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DNA Structure and Replication

DNA Structure and Replication
What is the approximate percentage of repetitive DNA sequences in human DNA?

40 to 50%
20 to 30%
10 to 20%
30 to 40%

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DNA Structure and Replication
DNA polymerases I also has

5'-3' exonuclease activity
3'-5'exonuclease activity
both (a) and (b)
5'-3' endonuclease activity

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DNA Structure and Replication
What bands will be observed in a cesium chloride gradient after two rounds of replication?

One medium band
One medium and one heavy band
One light, one medium and one heavy band
One light and one medium band

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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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DNA Structure and Replication
The RNA primers used to initiate replication in E. coli

are removed by helicase + ATP
are removed by Pol I
are joined together by DNA ligase
result in Okazaki fragments on leading strand

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DNA Structure and Replication
Which enzyme catalyzes the elongation of DNA molecules?

Primase
DNA ligase
Helicase
DNA polymerase

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