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DNA Structure and Replication

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

strandase
DNA polymerase
helicase
none of these

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DNA Structure and Replication
Telomeres are usually rich in which nucleotide?

Cytosine
Thymine
Guanine
Adenine

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DNA Structure and Replication
The nucleosome consists of histone

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

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

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

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DNA Structure and Replication
What does ligase do during replication of DNA?

Joins nicks in DNA strands
Digests mRNA when it is no longer needed
Makes copies of mRNA from DNA
Synthesizes the lagging strand

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DNA Structure and Replication
Enzymes, responsible for unraveling short segments of DNA is

helicase
primase
DNA ligase
DNA polymerase

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