5 Questions
Which type of organisms must continually turn genes on and off in response to signals from their external and internal environments?
Both prokaryotes and eukaryotes
In which type of organisms is regulation of gene expression essential for cell specialization?
Eukaryotes only
In prokaryotes, what occurs if tryptophan accumulates in a cell?
It shuts down the synthesis of more tryptophan by inhibiting enzyme activity
Which level of metabolic control allows a cell to adapt to short-term fluctuations in the supply of a substance it needs?
Adjusting the activity of enzymes already present
In which type of pathways is feedback inhibition typical?
Anabolic pathways
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.
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.
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