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There are 3 structural genes in in lac operon. . namely
Lac Z - codes for beta galactosidase (breaks lactose into galactose and glucose)
Lac Y - coding for beta galactoside permease ( pumps lactose into the cell)
Lac A - coding for transactylase (function is acetylation of lactose and so tht it can act as a messenger hope its not required for you in detail)
and a gene called
Lac i - coding for repressor protein (switching off the expression of stuctural genes)
refer Genetic for gardner of Molecular Biology by weaver if you are dealing in detail . .or the info i have provided is sufficient. . (and confusion or doubts mail me at vegi.chaitanya@gmial.com)
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∙ 12y ago
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∙ 14y agoBecause these genes must be expresses in order for the bacterium to be able to use the sugar lactose as food, they are called the lac operon.
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∙ 13y agoIf lactose is present, it binds to and inactivates the repressor by causing it to fall off the operator.
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∙ 13y agoIn the promoter, the RNA polymerase binds and then begins transcription. The lac repressors in the operator binds to the O region.
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∙ 12y agooperon a segment of chromosome consisting of an operator gene and closely linked strutural gene possessing related function.
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∙ 12y agoTo find an alternative source of carbon when glucose is not present in sufficient amounts.
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∙ 10y agoYOUR MOM!! simple as that.
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What genes is not a part of the lac operon?
repressor gene
Is the lac operon the only example of genes regulated by repressor proteins?
False
When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
When is gene expression blocked in the lac operon system?
The repressor protein blocks the genes from making mRNA.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
What genes is not a part of the lac operon?
repressor gene
Is the lac operon the only example of genes regulated by repressor proteins?
False
How many genes in the lac operon are found in e. coli?
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.
Is operon proteins?
Operon is not a protein. It is a segment of DNA that has cluster of genes controlled by the elements such as promoter, operator. Lac operon is a classic example where it regulate the utilization of Lactose in the medium.
When does the induction of the lac operon occur?
The lac operon is most active when glucose levels are low and lactose is present.
When is gene expression blocked in the lac operon system?
The repressor protein blocks the genes from making mRNA.
What turns the lac operon on and off?
The lac operon is turned off and on by repressors.
What is allolactose and how does it work?
Allolactose isca sugar, isomeric with lactose, that is the true inducer of the lac operon. An agent capable of activating specific genes. A molecule that inhibits the action of the repressor of an operon, preventing it from freely binding with the operator gene and disabling its function.
Is operon the sequence of bases on a gene that does not code for protein?
operon is a group of genes regulated by a single promoter and operator. . . generally all the genes (structural genes of a particular operon) regulate a specific metabolic pathway. . (eg : lac operon in bacteria; where 3 genes are regulated by a single promoter sequece which help in the catabolism of lactose). . . if you have any doubts mail me at vegi.chaitanya@gmial.com
What three adjacent structural genes does the Iac operon consist of?
The lac operon which facilitates or enables lactose digestion to take place has three adjacent structural genes. These genes include lacZ, lacY and lacA. They all have their own unique purpose.
The operon that controls the metabolism of lactose is called the what?
its an operon required for the transport and metabolism of lactose.
Why lac operon the gene expression is switch off?
explain the regulation of gene expression in lac operon.
