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Transcription and Regulation

Transcription and Regulation
RNA polymerase in prokaryotes has a removable

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

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Transcription and Regulation
Enhancers are regions that

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

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Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
Promoters for tRNAs are located

upstream from the start codon
none of these
downstream from the start codon
both (a) and (b)

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

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

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

Shine Dalgarno region
TATA box
CATT
SV40 region

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