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Transcription and Regulation

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

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

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

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

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

transcription factors
enhancers
start codons
promoters

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Transcription and Regulation
Transcription factors are

CATT boxes
proteins which bind to DNA and regulate transcription
TATA boxes
promoters

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Transcription and Regulation
The RNA polymerases that transcribe bacterial DNA are

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

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Transcription and Regulation
The nucleons of eukaryotic cell has

RNA polymerase II
RNA polymerase I
all of these
RNA polymerase III

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