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Transcription and Regulation

Transcription and Regulation
Enhancers are regions that

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

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

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

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Transcription and Regulation
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

none of these
RNA polymerase III
RNA polymerase II
RNA polymerase I

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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
Rho-dependent termination of transcription in E. coli

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

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Transcription and Regulation
Transcription begins

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

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