What does DnaA protein do?
DnaA is a protein that activates initiation of DNA replication in bacteria. It is a replication initiation factor which promotes the unwinding of DNA at oriC. The onset of the initiation phase of DNA replication is determined by the concentration of DnaA.
What is the primary function of the DnaA protein in bacterial DNA replication?
A replication initiator protein called DnaA binds to the origin sequence, unwinds the AT-rich origin sequence, and provides binding space for DnaB (DNA helicase) and DnaC to the site.
What is DnaA DnaB and DnaC?
DnaA and DnaC are specifically required at the stage of initiation of DNA replication from the E. coli replication origin (oriC) to load the replicative DNA helicase (DnaB) at this chromosomal site. Each of these proteins is multifunctional. DnaB and DnaC also form a complex with each other.
What best describes the role of DnaA?
Which of the following best describes the role of DNA? DNA translates the information in RNA to make proteins.
What is the difference between prokaryote and eukaryote chromosomes?
Eukaryotic chromosomes are located within the nucleus, whereas prokaryotic chromosomes are located in the nucleoid. The key difference between prokaryotic and eukaryotic cells is that eukaryotic cells have a membrane-bound nucleus (and membrane-bound organelles), whereas prokaryotic cells lack a nucleus.
What are the two main components of eukaryotic chromosomes?
Centromeres and telomeres are two essential features of all eukaryotic chromosomes.
What are Dnaa boxes?
DnaA box sequences are a common motif present within the replication origin region of a diverse group of bacteria and prokaryotic extrachromosomal genetic elements. A strict DnaA box sequence requirement for stable formation of that nucleoprotein structure was confirmed.
Where does transcription take place in the eukaryotic cell?
Initiation of Transcription in Eukaryotes. Unlike the prokaryotic RNA polymerase that can bind to a DNA template on its own, eukaryotes require several other proteins, called transcription factors, to first bind to the promoter region and then help recruit the appropriate polymerase.
How does RNA polymerase II transcribe genes in the eukaryotic cell?
RNA polymerase II (RNAPII) transcribes the major share of eukaryotic genes. During elongation, the transcription machinery needs to move histones out of the way every time it encounters a nucleosome.
What happens to pre mRNAs after transcription in eukaryotic?
Eukaryotic pre-mRNAs undergo extensive processing after transcription, but before translation.
How are activator and repressor proteins related to transcription?
Activator proteins increase the transcription rate, and repressor proteins decrease the transcription rate. Eukaryotic Transcription Initiation: A generalized promoter of a gene transcribed by RNA polymerase II is shown. Transcription factors recognize the promoter, RNA polymerase II then binds and forms the transcription initiation complex.