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

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

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Transcription and Regulation
The major function of RNA polymerase's sigma factor is

recognition of the transcriptional stop sequence
recognition of the transcriptional start sequence
recognition of the translational start sequence
recognition of the translational stop sequence

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