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Transcription and Regulation

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

transcription factors
start codons
enhancers
promoters

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

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

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Transcription and Regulation
RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________

transcription, DNA polymerase
transcription, RNA polymerase
translation, RNA polymerase
replication, DNA polymerase

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Transcription and Regulation
The closed complex at bacterial promoters is

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

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

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

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

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

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