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Transcription and Regulation

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

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

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Transcription and Regulation
Immediately after transcription

both (a) and (b)
a methylated guanine cap is added to the 31 end of the transcript
a poly adenylation signal is added
a methylated guanine cap is added to the 51 end of the transcript

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Transcription and Regulation
In prokaryotes, transcription is

terminated by a start codon
terminated by a protein called rho
terminated by the stop codon
terminated by a poly A sequence

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

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Transcription and Regulation
Transcription begins

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

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Transcription and Regulation
Promoters for tRNAs are located

upstream from the start codon
none of these
downstream from the start codon
both (a) and (b)

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