Which of the following statements can be made concerning the role of the lac repressor (Lac R) in conferring negative control of transcription of the lac operon? (mark all the correct answers)   All of the other answers are correct. Lac R dimers bind to two distant operator sites to form a Lac tetramer, which is facilitated by DNA looping. More than one operator sequence is required for maximal repression by Lac R. Mutations in Lac R that prevent it from binding allolactose result in repression of the lac operon, even in the presence of lactose. A repression loop formed by the binding of LacR to two operator sequences is required for maximal repression by LacR.

Q: All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT…

A: The lac operon is a clustered group of related genes that are transcribed as a single unit. These…

Q: If an abnormal repressor protein could still bind allolactose but the binding of allolactose did not…

A: Operon acts as a single regulated unit having one or more structural genes, promoter gene, a…

Q: n both glucose and lactose are present (regarding the lac operon): Group of answer choices…

A: An operon is a unit of gene expression found in bacteria that aids in the regulation of gene…

Q: The lac operon regulates expression of genes required for the breakdown of lactose. Use the…

A: The correct answers are 1- RNA polymerase can bind tightly to the lac Z promoter and activate a high…

Q: The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose…

A: The prokaryotic gene regulation is performed by the operon system. In this system the polycystronic…

Q: What effect will the above process have on the tryptophan operon? RNA polymerase will detach from…

A: An operon is a functional unit of DNA (Deoxyribonucleic acid) containing a cluster of genes under…

Q: Which of the following statements about the trp operon is false?

A: From above question the statement  If a mutation in region 2 prevents the formation of the 2 + 3…

Q: In the lac operon of E. coli, if glucose levels increase while lactose levels decrease, what will…

A: Gene regulation at the level of transcription in bacteria is achieved by the operon model. Operon…

Q: The trp operon in E. coli encodes enzymes essential for the biosynthesis of tryptophan. In the…

A: trp operon is a repressor operon found in E. coli bacteria, which consists of a group of genes that…

Q: In the absence of lactose, the genes of the lac operon are:     Not transcribed; because there is…

A: Introduction  In E. coli and numerous other enteric bacteria, the lactose operon (lac operon) is a…

Q: A bacterial cell with trp and lac operons in a medium with high concentration of lactose,…

A: *NOTE: Kindly repost for other questions. Dear Student as per the guidelines we are supposed to…

Q: n the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is…

A: An operon is a functional unit of DNA (Deoxyribonucleic acid) containing a cluster of genes under…

Q: A bacterial cell is mutated and cannot create the repressor protein associated with the Lac operon.…

A: Lac operon is associated with uptake and metabolism of lactose. It has several components such as a…

Q: e following genetic and cellular conditions.  You do not need to consider the role of CAP in your…

A: Upper operon -  Is is super repressor. Once it is present in the sequence, it can not be removed. If…

Q: Let’s suppose you have isolated a mutant strain of E. coli in which the lac operon is constitutively…

A: E.coli is a gram negative bacterium which thrives in the intestine of mammals. E.coli is beneficial…

Q: In order for the lac operon to be triggered, lactose must be present and ________.   a. cAMP levels…

A:

Q: A mutation in the lac I gene that prevents production of the lac repressor choose an answer below:…

A: lac operon also known as lactose operon was discovered by F. Jacob and J. Monod, for that, they…

Q: If there was a mutation such that the lac I protein could no longer bind lactose, but could still…

A: Lac operon is responsible for the metabolism of lactose in bacteria.

Q: What effect will the above process have on the tryptophan operon? RNA polymerase will detach from…

A: Regulation of gene expression is the mechanism by which the genes are switched off and on depending…

Q: Which of the following mutations would result in the highest level of lac operon transcription in…

A:

Q: Which of the below conditions would result in the lowest level of expression from the lac operon…

A: Option C is correct :

Q: An E. coli cell acquires a mutation in the gene that encodes CAP. The mutation affects the…

A: The transcription is a process through which information in the DNA molecule is transcribed into…

Q: If CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the…

A: Operon is the prokaryotic gene regulatory system that controls the expression of polycistronic mRNA.…

Q: A mutation prevents the catabolite activator protein (CAP) from binding to the promoter in the lac…

A: Mutation means sudden changes occur in DNA sequences. The mutation occurs randomly. It also occurs…

Q: Provide the SIGNIFICANT differences between the following

A: The process by which a cell regulates the conversion of DNA to RNA (transcription) and hence…

Q: Which of the following describes the lac operon in E. coli when lactose and glucose is present in…

A: The lac repressor acts as a lactose sensor. It normally blocks transcription of the operon, but…

Q: Bacteria with a lac phenotype are unable to use lactose because of some defect in expressing the…

A: Answers - 1) False 2) True 3) True  There are 3 structural genes in lac operon - lac Z, lac Y and…

Q: You have cells that are mutant in CAP protein such that it cannot bind to CAMP. For these mutant…

A: Cap protein- In solution, the catabolite activator protein (CAP, also known as cAMP receptor…

Q: For the lac operon, when glucose is absent and lactose is present ___________       None of the…

A: Question - For the lac operon, when glucose is absent and lactose is present ___________…

Q: Which of the following mechanisms is an example of post-transcriptional gene regulation? A. binding…

A: The DNA (deoxyribonucleic acid) is the hereditary unit of an organism. It consists of purines and…

Q: The lac operon regulates expression of genes required for the breakdown of lactose. Use the…

A: The lac operon regulates the expression of genes required for the breakdown of lactose through a…

Q: High levels of glucose in the environment result in low levels of transcription of the lac operon.…

A: Answer- glucose lowers the levels of cAMP, which is necessary to activate the CAP protein

Q: A researcher was trying to determine whether two molecules (A and B) were corepressors or inducers…

A: Gene expression is predominantly regulated at the transcriptional level, owing to protein binding to…

Q: If E. coli bacteria are placed in an environment that contains both glucose and lactose, the…

A: operon are made up of various structural gene which are regulated by same promoter and operator.

Q: When referring to attenuation in the regulation of the trp operon it would be safe to say that, when…

A: Attenuation is a regulatory mechanism that is employed in bacterial operons to guarantee that…

Q: In the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated…

A: The genes are the hereditary unit of an organism which are passed on from the parental generation to…

Q: How does the repressor protein contribute to selective expression of the structural genes Z, Y, and…

A: The prokaryotic gene expression is regulated by operon system, that regulates the transcription of…

Q: Assuming that the level of glucose is low, a mutation in the repressor associated with the lac…

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

Q: Which of the following is true about the Lac operon? Group of answer choices An operon with a…

A: Operon is the cluster of genes found in DNA. It consists os regulatory gene, structural gene,…

Q: Which of the following arabinose operon regulatory sites is exclusively involved in the repression…

A: Operon is a gene regulatory structure that contains clusters of genes and these clusters of genes…

Q: Regarding the trp operon: when levels of tryptophan are low, the ___ hairpin forms, resulting in…

A: Trp operon is negatively regulated by tryptophan which means in low concentration of tryptophan the…

Q: Under which of the following conditions will transcription of the lac operon occur?a) Lactose…

A: Introduction  All the gene expressions are under high regulation and this is necessary to avoid…

Q: You have an E.coli strain in which the lac operon is not expressed when glucose is absent and lacto…

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

Q: For some time, it was not clear whether lac repressor inhibits lac operon transcription by…

A: The binding of the lac repressor to the RNA(ribonucleic acid) polymerase of the lac transcription…

Q: The lac operon is a negative inducible system and allolactose will bind to the regulator protein…

A: In normal state, the lac operon is generally turned off. A repressor protein during "off" stage,…

Q: Which of the following statements about the lactose operon in E. coli is FALSE? Choose an answer…

A: The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when…

Q: In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan…

A: A trp operon is a group of genes that are transcribed, together to code for the components for the…

Q: For each of the following types of transcriptional control, indicate whether the protein produced by…

A: An inducible operon is one which is not transcribed. For transcription of the molecule, It requires…

Q: There is a mutation in sequence of the lac operator that prevents the lac repressor from being able…

A: Gene expression is regulated at the level of transcription by operon systems. In prokaryotes,…

Q: When CAMP binds to the Catabolite Activator Protein (CAP), it causes a conformational change on the…

A: cAMP  Cyclic Adenosine Monophosphate, it is an compound that act as secondary messenger and takes…

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.