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Transcription and Regulation

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

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

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

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

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

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

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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
The RNA polymerases that transcribe bacterial DNA are

only active inside the cell
highly glycosylated in their active forms
interchangable with DNA polymerases
multisubunit enzymes

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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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