Explain how the lac operon is both positively and negativelycontrolled.

Q: What are lac operon with suitable examples?

A: Bacteria such as E. coli usually live in animal intestines. Their food sources vary from hour to…

Q: Explain why catabolite repression is used in regulating the lac operon and describe how it…

A: An Operon is a unit of structure and function that consists of the clusters of regulatory genes…

Q: Under what conditions is lac repressor bound to the lac operon?

A: Lactose operon (Lac operon) was discovered in Escherichia coli. This is studied to understand the…

Q: Explain, with diagrams, how transcriptionattenuation works in the trp operon.

A: Atteunation is a mechanism of control in some bacterial operons which results in premature…

Q: In the lac operon, the product of structural gene lacY is capable of

A: Lac operon It contains a operator, a promoter, repressor, and structural gene. The structural gene…

Q: Describe briefly the Trp operon? Why is it considered an example of negative regulation?

A: An operon is a cluster of genes that are transcribed together to give a single messenger RNA (mRNA)…

Q: What is the function of the Z gene of the Lac operon?

A: The lactose is cleaved into glucose and galactose by the enzyme β-galactosidase which is coded by…

Q: Explain how glucose represses the lac operon.

A: Operons can be defined as the regions of DNA that contain the clusters of related genes. They are…

Q: Give the Evidence for the trp Operon ?

A: If tryptophan is available in the surrounding the E. coli (bacteria)  will take it up and use it to…

Q: c) Mention to two biochemical procedures that can provide information about CAP and LacR binding to…

A: The lac repressor LacR acts as a lactose sensor and blocks transcription when lactose levels are…

Q: Explain how repressor proteins can be central to theregulation of both catabolic and anabolic…

A: Repressor proteins are those that respond to external stimuli to prevent the binding of…

Q: Describe the difference between a repressible and an inducible operon.

A: The theory of Operon comes from the concept of "gene-regulation"  proposed by Jacob and Monod. It is…

Q: Please discuss positive regulation with respect to lac operon.

A: An expression of a gene is evidenced by the synthesis of the polypeptide chain encoded by the…

Q: Describe how the trp operon is under negative control

A: Introduction  Gene Regulation: Expression of gene is highly regulated in both prokaryotes as well as…

Q: Why is the TRP operon considered a repressible operon, while the LAC operon is considered an…

A: Operons are areas of DNA which are composed of cluster of related genes which are controlled by…

Q: Distinguish between a repressible operon and aninducible operon.

A: The Operon is the regulatory system present in DNA in cluster form, which contains structural genes…

Q: How is glucose involved in positive control of the lac operon?

A: A set of genes present in E.coli. that regulates the uptake of lactose from the surrounding…

Q: What is the function of each of the parts of the lac operon (promoter, operator, CAP binding site,…

A: The lactose operon (also called the lac operon) is a group of genes present in E. coli and other…

Q: Define regulation of gene expression with suitable model (lac operon) ?

A: Gene expression is the process by which the instructions in the DNA are converted into a functional…

Q: Differentiate inducsible and repressible operon

A: The promoter and operator control the group of genes which are called operons. Some operons are…

Q: Do you expect operons to occur extensively in Eukaryotes? Yes or no and explain.

A: Operons (clusters of co-regulated genes with related functions) are a well-known feature of…

Q: Describe the organization of the trp operon.

A: Tryptophan operon (trp operon) is the mechanism of the biosynthesis of tryptophan in the E. coli.…

Q: Give the Genetic Proof of the Operon Model ?

A: An operon represents a genetic unit with one or more structural genes and an operator sequence and…

Q: Describe the feature of lac operon?

A: The operon comprises the genes regulating a metabolic reaction. It is also an operon. It mainly…

Q: Discuss the concept of an operon and the roles of the various components in the E. coli lac operon.

A: Escherichia coli is referred to as a gram-negative, rod-shaped, facultative anaerobic, and coliform…

Q: What is the order of ZYA on the lac operon?

A: Lac operon includes a set of genes having a single promoter, which enables the bacterium to secrete…

Q: Describe the main features of the lactose operon and inducibleoperons.

A: Inducible operons are those in which genes for certain enzymes can be turned on by the substrate of…

Q: Distinguish between an operon and a regulon.

A: The process of activation and deactivation of the genes as per their requirement by the cells is…

Q: Explain how regulatory regions of the lac operon canbe used in the production of pharmaceutical…

A: The lac operon is an operon that allows the bacteria to use lactose to synthesize energy. It is…

Q: Why does the lac operon include more than one operator sequence?

A: Lactose operon (lac operon) is an operon required for the transport and metabolism of lactose in…

Q: Explain how the trp operon is regulated by trp repressor and by attenuation.

A: Gene is the hereditary unit occupying a specific position in the chromosome and carries information…

Q: What is lac operon?

A: Lac operon  ,this concept was proposed by Jacob and monod in 1965. Operon is a functioning unit of…

Q: What structural features does the trp operon share with the lac operon?

A: Genes are collections of nucleotides that code for a specific protein. For protein synthesis to…

Q: Describe the role of the CRP–cAMP complex in positiveregulation of the lactose operon in E. coli.

A: The E. coli lac operon includes genes involved in lactose metabolism. It is only expressed when…

Q: Briefly describe the lac operon and how it controls the metabolism of lactose.

A: In prokaryotes gene expression the gene expression occurs in a polycistronic manner. Polycistronic…

Q: Would you expect to see attenuation in the lac operon and other operons that control the metabolism…

A: Lac operon contains genes that are involved in the lactose metabolism. It is expressed when lactose…

Q: The lac operon is an inducible operon. What does this mean?

A: Operons are the groups of genes related to a single pathway and controlled by a single promoter.…

Q: DEFINE what is an Operon, and compare and contrast regulation of the LAC Operon and the TRP Operon.…

A: As per our honor code, we are allowed to answer one question at a moment. You have posted multiple…

Q: explain how the Lac operon gets turned on and off .

A: Introduction :- Three structural genes, as well as a promoter, a terminator, a regulator, and an…

Q: What is operon? How does the lac operon work?

A: A specific sequence of nucleotides in DNA is called DNA. It is a hereditary unit which is…

Q: Explain the process of attenuation in the trp operon under the following conditi (i) No tryptophan…

A: Answer

Q: Define about lactose (lac) operon ?

A: The lactose operon also known as the lac operon is a set of genes that are specific for uptake and…

Q: With respect to the lac operon, what is allolactose?

A: It is an operon required for the transport and metabolism of lactose in E.coli and many enteric…

Q: Highlight the main points of lac operon operation.

A: In prokaryotes, gene regulation is most prominent during the start of transcription. As a result,…

Q: Why do scientists define the trp operon as repressible and the lac operon as inducible?

A: Operon is a combination of genes that are transcribed by the same promoter.

Q: What does the lac operon consist of? How is the operator switch turned on and off in the expression…

A: Lac operon is the operon or machinery for the transport and metabolism of lactose in Escherichia…

Q: Summary of key lac operon phenotypes?

A: Lac operon, explained by Jacob and Monad is a set of genes that control the metabolism and uptake of…

Gene Interactions

When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.

Gene Expression

Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.