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

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DNA Structure and Replication
The chromosomal DNA complexes with

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

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DNA Structure and Replication
Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

All of these
3' → 5' exonuclease
5' → 3' polymerase
5' → 3' exonuclease

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DNA Structure and Replication
What is the approximate size (in kb) of the E. coli genome?

4500 kilobase
5500 kilobase
3000 kilobase
6500 kilobase

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DNA Structure and Replication
The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

DNA polymerase
helicase
strandase
none of these

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

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

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