How is the trp operon different from the lac operon?

What is the difference between Lac operon and Trp operon? Lac operon is involved with the catabolic process of a sugar, but Trp operon is involved in the anabolic process of an amino acid. Lac operon gets activated in the presence of lactose, but Trp operon gets deactivated in the presence of tryptophan.

What is the difference between a Regulon and an operon?

Operons are related to regulons, stimulons and modulons; whereas operons contain a set of genes regulated by the same operator, regulons contain a set of genes under regulation by a single regulatory protein, and stimulons contain a set of genes under regulation by a single cell stimulus.

What is the purpose of trp operon?

The trp operon, found in E. coli bacteria, is a group of genes that encode biosynthetic enzymes for the amino acid tryptophan. The trp operon is expressed (turned “on”) when tryptophan levels are low and repressed (turned “off”) when they are high. The trp operon is regulated by the trp repressor.

How is the lac repressor different from the trp repressor?

a small effector molecule that binds to a repressor protein to inhibit transcription. another difference is that the lac repressor binds the DNA sequence found in the lac operator site,where as the trp repressor recognizes a different DNA sequence that is found in the trp operator site.

How do miRNA recognize a particular target mRNA?

How do miRNA recognize a particular target mRNA? 1) The miRNA and mRNA have the same sequence so they base pair. 2) The miRNA sequence is complementary to the mRNA sequence so they base pair. 3) The binding of miRNA complex to RISC alters the RISC complex so these proteins bind directly to the mRNA.

What do you mean by operon?

Operon: A set of genes transcribed under the control of an operator gene. More specifically, an operon is a segment of DNA containing adjacent genes including structural genes, an operator gene, and a regulatory gene. An operon is thus a functional unit of transcription and genetic regulation.

How are Lac and trp operons related to each other?

Comparing lac and trp Operons. Regulates the production of the amino acid tryptophan. Consists of a cluster of 5 genes under control of one promoter. When tryptophan levels are high (diet), it acts as a corepressor and binds to trp repressor protein altering its shape so that it can bind to trp operator blocking transcription of mRNA.

What is the function of the Y gene in lac operon?

y gene – It codes for permease which regulates the lactose permeability in the cell. a gene – It codes for transacetylase which assists the enzyme beta-galactosidase. Hence, all these genes help in lactose metabolism. In lac operon, lactose acts as an inducer.

Which is part of the trp operon produces tryptophan?

The operon consists of trp E, trp D, trp C, trp B, and trp A, which collectively code tryptophan synthetase; the enzyme which produces tryptophan. The trp operon also contains trp R that produces a repressor when needed.

What is the role of the lac operon in E coli?

Lac operon is the cluster of genes responsible for lactose transportation and metabolism in E.coli bacteria. The operon has one promoter region and genes lac Z, lac Y, lac A, and lac I. The operon is activated by the presence of lactose.