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Transcription and Regulation

Transcription and Regulation
Upstream regions which are essential for correct transcription are called

transcription factors
promoters
enhancers
start codons

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

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

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Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
In prokaryotes, transcription is

terminated by a protein called rho
terminated by the stop codon
terminated by a start codon
terminated by a poly A sequence

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Transcription and Regulation
RNA polymerase in prokaryotes has a removable

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

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

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

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