Transcription and Regulation
Transcription of each set of rRNA genes by RNA polymerasel produces

a single 5S rRNA precursor molecule
a single 45S rRNA precursor molecule
a single 18S rRNA precursor molecule
a single 28S rRNA precursor molecule

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Transcription and Regulation
The transcriptional regulatory proteins in eukaryotes which induce transcription usually have

at least one distinct domains of protein structure, a DNA binding domain and an activation domain
at least two distinct domains of protein structure, a DNA binding domain and an activation domain
none of these
at least two distinct domains of protein structure and a DNA binding domain

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