Metabolic regulation - positive control: activation

5 important questions on Metabolic regulation - positive control: activation

How is the regulatory protein called in positive control of transcription?

An activator

In positive control an activator cannot bind tot the DNA unless somthing binds first..

The inducer

Like repressor proteins, activator proteins bind specificaly to certain chemical groups within the DNA. However, the region on the DNA that is the binding site of the activator is not called the operator but is called:

Activator-binding site
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What is the role of the activator protein in positive controlled transcription?

To help the RNA polymerase recognize the promotor and begin transcription.

In positive controlled gene transcriptin DNA-looping can occour. What is DNA looping and why does it happen?

The activator protein can bend DNA. Allowing the RNA polymerase to make contact with nucleotides in the promotor region. (when the activator binding site is several hundred base pairs away from the promotor)

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