Lac Operon

a: Lac operon ~
b: A thermostat

What: Lac operon is like a thermostat in which the substrate, lactose, induces production of the enzyme that will break it down, lac. Thermostats turn on when the temp is low (for example), and will turn off when the temp is too hi. The lac operon does the same thing, in low concentrations of lactose, it's off, and in high concentrations, its on. Since the product is glucose, and high glucose levels also dampen the production of Lac genes, It's an example of feedback inhibition." See comment in link.

Writer: gibbie99
Date: Jun 9 2010 7:01 AM

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