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The protein used by some prokaryotes that blinds to the operator blocking rna polymerase so transcription cannot take place is called the

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mRNA

These prokaryotes are unicellular organisms that have only one cell. They are single-celled organisms which does not have a true nucleus or a nucleus which governs the different activities of the cell, instead their DNA is scattered in a specific area within its cytoplasm. They reproduce by binary fission.
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