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DNA Structure and Replication

DNA Structure and Replication
Klenow fragment without free nucleotides exhibits

endonuclease activity
no activity
nickase activity
exonuclease activity

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DNA Structure and Replication
If one cell has AT contents 40%, what will be the percentage of Guanine residue?

30%
15%
60%
Guanine residue can not be calculated

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DNA Structure and Replication
E.coli DNA polymerases II and III lack

partially 5' → 3' exonuclease activity
partially 5' → 3' endonuclease activity
5' → 3' exonuclease activity
5' → 3' endonuclease activity

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DNA Structure and Replication
The chromosomal DNA complexes with

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

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DNA Structure and Replication
30 nm wide helix with five or six nucleosomes per helix is known as

none of these
solenoid
kinoplast
halonoid

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

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

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