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Transcription and Regulation

Transcription and Regulation
RNA polymerase in prokaryotes has a removable

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

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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 III
RNA polymerase II
none of these
RNA polymerase I

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

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

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Transcription and Regulation
In both eukaryotes and prokaryotes, a promoter region that is rich in AT bases is called as

CATT
TATA box
SV40 region
Shine Dalgarno region

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

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

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Transcription and Regulation
The closed complex at bacterial promoters is

in equilibrium with free RNA polymerase and the promoter
not affected by promoter mutations
bound more tightly when repressors are present
not affected by activator proteins

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