What are the two important differences between eukaryotic and prokaryotic transcription initiation? I - Eukaryotic promoters have varied consensus...
What are the two important differences between eukaryotic and prokaryotic transcription initiation?
I - Eukaryotic promoters have varied consensus sequences, while prokaryotic promoters have the same consensus sequences in positions -10 and -35.
II - Eukaryotic RNA polymerase requires the binding of several proteins to the promoter region before it can bind to DNA, while prokaryotic RNA polymerase can bind directly to DNA.
III - Eukaryotic promoters have hairpin loops in the RNA transcript, while prokaryotic promoters do not.
IV - Eukaryotic transcription initiation requires the phosphorylation of the CTD tail of RNA polymerase, while prokaryotic transcription initiation does not.
a) I and III
b) II and IV
c) I and II
d) II and III
I - Eukaryotic promoters have varied consensus sequences, while prokaryotic promoters have the same consensus sequences in positions -10 and -35.
II - Eukaryotic RNA polymerase requires the binding of several proteins to the promoter region before it can bind to DNA, while prokaryotic RNA polymerase can bind directly to DNA.
III - Eukaryotic promoters have hairpin loops in the RNA transcript, while prokaryotic promoters do not.
IV - Eukaryotic transcription initiation requires the phosphorylation of the CTD tail of RNA polymerase, while prokaryotic transcription initiation does not.
a) I and III
b) II and IV
c) I and II
d) II and III
💡 1 Resposta
Ed 
A alternativa correta é a letra C) I e II. As duas diferenças importantes entre a iniciação da transcrição em eucariotos e procariontes são: I - Promotores eucarióticos têm sequências de consenso variadas, enquanto promotores procariontes têm as mesmas sequências de consenso nas posições -10 e -35. II - A RNA polimerase eucariótica requer a ligação de várias proteínas à região do promotor antes de poder se ligar ao DNA, enquanto a RNA polimerase procarionte pode se ligar diretamente ao DNA.
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