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Transcription and Regulation

Transcription and Regulation
RNA polymerase in prokaryotes has a removable

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

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Transcription and Regulation
The nucleons of eukaryotic cell has

RNA polymerase III
RNA polymerase II
RNA polymerase I
all of these

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

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

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

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Transcription and Regulation
The binding of lac repressor to DNA could be considered to be analogous to

competitive inhibition of an enzyme
allosteric effects in enzyme regulation
uncompetitive inhibition of an enzyme
mixed-type inhibition of an enzyme

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Transcription and Regulation
Enhancers are regions that

bind RNA polymerase
are CAT box binding proteins
are adjacent to the TATA box
modulate transcription

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