The function of DNA gyrase in DNA replication is()?
A. primer for synthesis of the replication initiation
B. catalyze transport reaction
C. the DNA double strand unwinding before the replication fork
D. the DNA on the replication fork is broken by breaking the hydrogen bond
E. enables replication to move in both directions from the start
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Which one of the following structures does bacterial cells terminate transcription by recognizing?()
A. Terminator
B. Hairpin structure
C. Termination codon
D. SD sequence
E. Dissociation of σ subunit of RNA polymerase
In vertebrate genes, which CpG modified transcriptional regulatory sites containing CpG islands will be inactivated?()
A. Methylation
B. Alkylation
C. Phosphorylation
D. Acetylation
E. Ubiquitination
The following are not nucleosome core granule proteins()
A. H1
B. H2A
C. H2B
D. H3
E. H4
The synthesis of messenger RNA encoding eukaryotic ribosomal protein occurs in()
A. cytoplasm
B. Nuclear membrane
C. nucleolus
D. euchromatin
E. heterochromatin
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