16th October 2019

wikipedia
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Why is beta galactosidase important?

β-galactosidase is important for organisms as it is a key provider in the production of energy and a source of carbons through the break down of lactose to galactose and glucose. Many adult humans lack the lactase enzyme, which has the same function of beta-gal, so they are not able to properly digest dairy products.

Subsequently, one may also ask, is B galactosidase an enzyme?

β-Galactosidase has three enzymatic activities (Fig. 1). First, it can cleave the disaccharide lactose to form glucose and galactose, which can then enter glycolysis. Second, the enzyme can catalyze the transgalactosylation of lactose to allolactose, and, third, the allolactose can be cleaved to the monosaccharides.

What is Lac I?

The lac repressor is a DNA-binding protein which inhibits the expression of genes coding for proteins involved in the metabolism of lactose in bacteria.

How is the lac operon turned on and off?

Allolactose is an example of an inducer, a small molecule that triggers expression of a gene or operon. The lac operon is considered an inducible operon because it is usually turned off (repressed), but can be turned on in the presence of the inducer allolactose.
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