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Transcription and Regulation

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

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

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

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

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

promoters
enhancers
transcription factors
start codons

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

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Transcription and Regulation
Enhancers are regions that

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

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Transcription and Regulation
Transcription begins

upstream from the start codon
at the start codon
none of these
downstream from the start codon

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