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DNA Structure and Replication

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

none of these
helix frequency
linking number
twisting number

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DNA Structure and Replication
The chromosomal DNA complexes with

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

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DNA Structure and Replication
Which of the following species lack a 'classical' histone H1?

Xenopus laevis
Saccharomyces cerevisiae
Arabidopsis thaliana
Strongylocentrotus purpuratus

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DNA Structure and Replication
How does ethidium bromide interact with DNA?

It binds to phosphate
It intercalates between bases
It does not interact
It binds to adenine

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DNA Structure and Replication
Which of the following would not contain DNA?

Yeast
Mold
Glass crystals
Bacteria

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

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

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