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What are the components of an operon? What important regulator is not part of the actual operon? Know how operons are classified and how each type works (Inducible, Repressible, Positive, Negative.)

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This posting shows how operons are classified and how each type works. References are also provided to justify the assertions.

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1.What are the components of an operon? What important regulator is not part of the actual operon?

The components of the operon include:

? The regulatory gene codes for the repressor protein.
? The promoter site is the attachment site for RNA polymerates.
? The operator site is the attachment site for the repressor protein.
? The structural genes code for the proteins.
? The repressor protein is different for each operon and is custom fit to the regulatory metabolite. Whether or not the repressor protein can bind to the operator site is determined by the type of operon.
? The regulatory metabolite is either the product of the reaction or the reactant depending on the type of operon.
? The messenger RNA.
? The final enzyme. (library.thinkquest.org/28751/review/genetics/7.html)

Regulatory genes need not be part of the operon itself, but may be located elsewhere in the genome.

2. Know how operons are classified and how each type works.

In genetics, an operon is a functioning unit of genomic material that contains a cluster of genes under the control of a single regulatory signal or promoter (Jacob, Perrin, Sanchez, & Monod, 1960).

Operons are classified as follows:

1. ...

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