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Questions and Answers
Which type of organisms must continually turn genes on and off in response to signals from their external and internal environments?
Which type of organisms must continually turn genes on and off in response to signals from their external and internal environments?
In which type of organisms is regulation of gene expression essential for cell specialization?
In which type of organisms is regulation of gene expression essential for cell specialization?
In prokaryotes, what occurs if tryptophan accumulates in a cell?
In prokaryotes, what occurs if tryptophan accumulates in a cell?
Which level of metabolic control allows a cell to adapt to short-term fluctuations in the supply of a substance it needs?
Which level of metabolic control allows a cell to adapt to short-term fluctuations in the supply of a substance it needs?
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In which type of pathways is feedback inhibition typical?
In which type of pathways is feedback inhibition typical?
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Study Notes
Gene Regulation
- Eukaryotic organisms must continually turn genes on and off in response to signals from their external and internal environments.
- Regulation of gene expression is essential for cell specialization in eukaryotes.
Prokaryotes and Gene Regulation
- In prokaryotes, when tryptophan accumulates in a cell, it triggers a negative feedback loop, shutting down the expression of the tryptophan operon.
Metabolic Control
- The level of metabolic control that allows a cell to adapt to short-term fluctuations in the supply of a substance it needs is allosteric control.
Feedback Inhibition
- Feedback inhibition is typical in biosynthetic pathways, where the end product of a metabolic pathway inhibits the activity of the enzyme that catalyzes the first committed step of the pathway.
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Description
Test your knowledge of gene expression regulation in this Molecular Biology lecture 7 quiz. Explore the mechanisms by which organisms control the expression of genes in response to internal and external signals.
