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Home Q & A Board Biology-Related Homework Help Cell Biology
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Glomeris Glomeris
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5 months ago
In prokaryotic cells certain substances trigger gene expression (for example, if there is lactose to be digested, lactose itself starts a reaction that leads to  the transcription of the genes that code for the enzymes to digest it).
In eukaryotes gene expression is controlled by transcription factors, but what controls their production?
While the process in prokaryotes explains how regulation occurs, what is the real cause of gene expression in eukaryotes?
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Anonymous
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#1
5 months ago
Quote from: Glomeris (5 months ago)
In eukaryotes gene expression is controlled by transcription factors, but what controls their production?

Transcription factors are produced as a response to a signal. The cell picks up on signals, such as a spike in a certain hormone or molecule that triggers a cascade of cellular response leading to the production of proteins (which later act as transcription factors) or the signal itself triggers a production of the protein directly. For example, in the case of human growth hormone, the molecule itself interacts with the DNA directly rather than relaying the message from the cellular membrane.

Does that make more sense?
Glomeris Author
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#2
5 months ago
Yes, thank you.
It's much clearer now. Unluckily I had been given bad information at school
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