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DNA Structure and Replication

DNA Structure and Replication
DNA polymerases I also has

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

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DNA Structure and Replication
The nicks or gaps between Okazaki fragments are eventually sealed by

gyrase
DNA ligase
polymerase
RNA ligase

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

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

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DNA Structure and Replication
What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?

B
H
None of these
S

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DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

DNA was responsible for heredity
proteins and DNA were responsible for heredity
phage DNA was similar to bacterial DNA
the ratio of Adenine to thymine was always the same

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