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Transcription and Regulation

Transcription and Regulation
RNA polymerase in prokaryotes has a removable

sigma subunit
both (a) and (b)
alpha subunit
beta subunit

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

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

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Transcription and Regulation
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

RNA polymerase II
RNA polymerase III
RNA polymerase I
none of these

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Transcription and Regulation
Each tRNA molecule has a cloverleaf secondary structure consisting of

two stem loops
four stem loops
either (a) or (b)
three stem loops

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Transcription and Regulation
Rho-dependent termination of transcription in E. coli

removes mRNA and holoenzyme from the DNA
requires about 50 nucleotides of uncomplexed mRNA
both (a) and (b)
requires ATP

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Transcription and Regulation
Transcription begins

downstream from the start codon
upstream from the start codon
at the start codon
none of these

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