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DNA Structure and Replication

DNA Structure and Replication
DNA replication takes place in which direction?

5 'to 3'
Randomly
Vary from organism to organism
3' to 5'

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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?

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

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

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DNA Structure and Replication
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

purines
All of these
pyrimidines
protamines

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DNA Structure and Replication
The nucleosome consists of histone

None of these
hexamer and 146 bp of DNA
octamer and 146 bp of DNA
tetramer and 146 bp of DNA

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DNA Structure and Replication
DNA helicase is used to

None of these
break a phosphodiester bond in DNA strand
interact the double helix closely
unwind the double helix

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