The diagram below represents the tryptophan operon with the trp leader MRNA transcript enlarged to represent the AUG transiation start codon, two consecutive tryptophan amino acid codons (UGGUGG), and 4 regions (1, 2, 3, and 4) that base pair to form different hairpin-loop structures in the MRNA leader region. What would happen in this mRNA leader region when cells encounter very low levels of tryptophan in its environment? Leader region trpE trpD trpC trpB trpA DNA 5' Transcription trp leader sequence mRNA UGGUGG (tryptophan codons) AUG UUUUUU O The translating ribosome would stall at the two tryptophan codons, causing the formation of a hairpin-loop botween regions 3 and 4 to promote transcription of the trp operon OThe translating ribosome would stall at the two tryptophan codons causing formation of hairpin-loop between regions 2 and 3, which functions as an ant-tarminator of transcription. O The translating ribosome would stall at the two tryptophan codons causing formation of hairpin-locp between regions 1 and 2, which functions as a torminator of transcriotion O The translating ribosome would stall at the UUUUUU sequence to prevent the formation of a transcription termination loop The translating ribosomo would stall at the two tryptophan codons causing formation of hairpin-loop between rogions 2 and 3, which functions as an anti-terminator of transcnption
The diagram below represents the tryptophan operon with the trp leader MRNA transcript enlarged to represent the AUG transiation start codon, two consecutive tryptophan amino acid codons (UGGUGG), and 4 regions (1, 2, 3, and 4) that base pair to form different hairpin-loop structures in the MRNA leader region. What would happen in this mRNA leader region when cells encounter very low levels of tryptophan in its environment? Leader region trpE trpD trpC trpB trpA DNA 5' Transcription trp leader sequence mRNA UGGUGG (tryptophan codons) AUG UUUUUU O The translating ribosome would stall at the two tryptophan codons, causing the formation of a hairpin-loop botween regions 3 and 4 to promote transcription of the trp operon OThe translating ribosome would stall at the two tryptophan codons causing formation of hairpin-loop between regions 2 and 3, which functions as an ant-tarminator of transcription. O The translating ribosome would stall at the two tryptophan codons causing formation of hairpin-locp between regions 1 and 2, which functions as a torminator of transcriotion O The translating ribosome would stall at the UUUUUU sequence to prevent the formation of a transcription termination loop The translating ribosomo would stall at the two tryptophan codons causing formation of hairpin-loop between rogions 2 and 3, which functions as an anti-terminator of transcnption
Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Christine Evers, Lisa Starr
Chapter7: Gene Expression And Control
Section: Chapter Questions
Problem 4CT
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Transcribed Image Text:The dlagram below represents the tryptophan operon with the trp leader MRNA transcript enlarged to represent the AUG transiation start codon, two consecutive tryptophan amino acld codons (UGGUGG), and 4
regions (1, 2, 3, and 4) that base pair to form different hairpin-loop structures in the MRNA leader region. What would happen in this MRNA leader region when cells encounter very low levels of tryptophan in Its
environment?
Leader region
trpE
trpD
trpC
trpB
trpA
DNA
5'
3'
Transcription
trp leader sequence mRNA
UGGUGG
(tryptophan
codons)
AUG
UUUUUU
1
3
4.
The translating ribosome would stall at the two tryptophan codons, causing the formation of a hairpin-loop botween regions 3 and 4 to promote transcription of the trp operon.
The translating ribosome would stall at the two tryptophan codons causing formation of hairpin-loop between regions 2 and 3, which functions as an anti-lerminator of transcription
The translating ribosome would stall at the two tryptophan codons causing formation of hairpin-loop between rogions 1 and 2, which functions as a torminator of transcription.
The translating ribosome would stall at the UUUUUU sequence to prevent the formation of a transcription tormination kloop.
O The translating tibosomo wouid stall at the two tryptophan codons causing formation of hairpin-loop between regions 2 and 3, which functions as an anti-torminator of transcription.
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