its an operon required for the transport and metabolism of lactose.
Lac operon. Look in the textbook newfag
lac
My answer is 3, I am pretty sure I am right, but I would double check to make sure. I am in ninth grade taking biology at PineTree.
Catabolite repression is the positive control of the lactose operon in bacteria. Glucose is metabolized initially and when depleted, the lactose.
lactose metabolizing enzymes need not be made when lactose is not present.
The lac repressor protein has a binding site for lactose itself.
The lac operon encodes enzymes required in the digestion and transport of lactose. Transcription is activated when there is lactose in the cellular environment, and RNA polymerase binds to the promoter region of the operon, and activates the expression of lacA, lacZ and lacY.
Lactose is present, otherwise the lac operon is not needed and is shut off.
When the lac operon controls the expression of proteins in the E.coli cell that can break down lactose into two sugars, glucose and galactose. When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.
The lac operon is most active when glucose levels are low and lactose is present.
When the lac operon controls the expression of proteins in the E.coli cell that can break down lactose into two sugars, glucose and galactose. When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.
My answer is 3, I am pretty sure I am right, but I would double check to make sure. I am in ninth grade taking biology at PineTree.
Catabolite repression is the positive control of the lactose operon in bacteria. Glucose is metabolized initially and when depleted, the lactose.
Only when lactose is present; if glucose is present the cell will metabolize glucose over lactose due to glucose being easier for the cell to metabolize.
lactose metabolizing enzymes need not be made when lactose is not present.
The "lac operon" is the unit of DNA in E.coli and other bacteria which is responsible for the metabolism of lactose. So with regards to the question above, its function is that of an operator.
E. coli binds with lactose which changes its conformation so that it no longer binds to DNA. This allows the lactose operon to be transcribed.
The lac operon is most active when glucose levels are low and lactose is present.
it is by lac operon syastem