An operon consists of
an operator, promoter, regulator, and structural genes
.
What are the parts of a operon?
- A regulatory gene. The regulatory gene codes for a regulatory protein. …
- An operator. The operator is the region of DNA of the operon that is the binding site for the regulatory protein.
- A promoter. …
- Structural genes.
What are the parts in the DNA sequence of an operon?
The DNA of the operon contains
three genes, Gene 1, Gene 2, and Gene 3
, which are found in a row in the DNA. They are under control of a single promoter (site where RNA polymerase binds) and they are transcribed together to make a single mRNA that has contains sequences coding for all three genes.
What are the parts of an operon quizlet?
- promoter. site on DNA bound by the RNA polymerase; directs the initiation of transcription.
- activator. …
- activator binding site. …
- repressor. …
- operator. …
- effector. …
- inducer. …
- corepressor.
What are the four parts of an operon quizlet?
What are the 4 elements normally contained within an Operon?
Regulatory gene, Promoter, Operator, structural Genes
.
What are the three parts to an operon?
- Promoter – a nucleotide sequence that enables a gene to be transcribed. …
- Operator – a segment of DNA to which a repressor binds. …
- Structural genes – the genes that are co-regulated by the operon.
What are the five components of an operon?
An operon consists of
an operator, promoter, regulator, and structural genes
.
What is lac operon model?
The lactose operon (lac operon) is an
operon required for the transport and metabolism of lactose in E. coli and many other enteric bacteria
. … The gene product of lacZ is β-galactosidase which cleaves lactose, a disaccharide, into glucose and galactose.
What are the two types of operons?
Operons are of two types,
inducible and repressible
.
How many types of operons are there?
Operons can be of
two types
: Inducible – This type of operon is switched on in the presence of inducer, e.g. Lac operon.
What is operon concept?
Definition. Operon Theory is
the concept of gene regulation proposed by François Jacob
and Jacques Monod (1961). An operon is a group of structural genes whose expression is coordinated by an operator. The repressor encoded by a regulatory gene binds to the operator and represses the transcription of operon.
What is a Cistron Toppr?
Cistron is
the segment of DNA having information for synthesis of a particular protein or RNA
. The segment encodes for the synthesis of RNA or polypeptide of protein molecule.
What best defines an operon?
An operon is
a region of DNA that consists of a single gene regulated by more than one promoter
. An operon is a region of RNA that consists of the coding regions of more than one gene. An operon is a region of DNA that codes for a series of functionally related genes under the control of the same promoter.
What are the basic components of the lac operon?
The lac operon consists of three structural genes:
lacZ, which codes for β-galactosidase, which acts to cleave lactose into galactose and glucose
; lacY, which codes for lac permease, which is a transmembrane protein necessary for lactose uptake; and lacA, which codes for a transacetylase that transfers an acetyl group …
How does the lac operon function?
The lac, or lactose, operon is found in E. coli and some other enteric bacteria. This operon contains
genes coding for proteins in charge of transporting lactose into the cytosol and digesting it into glucose
. This glucose is then used to make energy.
What is a repressor molecule?
A repressor is
a protein that turns off the expression of one or more genes
. The repressor protein works by binding to the gene’s promoter region, preventing the production of messenger RNA (mRNA).
