Figure 5 shows the lac operon structure in Escherichia coli.   a) Name structures P, Q and R. b) Name substance S. c) What is the enzyme encoded by gene I. Give its function. d) What will happen if substance S is absent in the medium?

Q: When tryptophan levels are high in E. coli, what conformation does the trp leader mRNA adoptand what…

A: The question is asking about the effect of high tryptophan levels on the conformation of the trp…

Q: )  increased cAMP concentrations and reduction of lac operon gene expression   b)  increased cAMP…

A: The lac operon is a well-studied genetic system found in bacteria, particularly in Escherichia coli…

Q: The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of…

A: Operon  Operon is a place within the DNA which have several gene and all these genes are controlled…

Q: For the Escherichia coli lactose operon genotypes listed, + indicates a functional component, -…

A: Permit me to elaborate on these lac operon strains' genotypes and phenotypes:  1. lacZ+ lacZ+ lacY+…

Q: 1. a)how is it possible for such drugs to selectively kill bacterial cells and not our own cells?…

A: The chemicals or the drugs that are employed to kill bacteria are termed antibiotics. The regulation…

Q: Which of the following statements is not true of both the LacI and TrpR repressor proteins?a) an…

A: The objective of the question is to identify the statement that is not true for both LacI and TrpR…

Q: Which of the following statements about the expression of the repressor (lacl) gene in the lac…

A: The lac operon's transcription is repressed (inhibited) by the lac repressor protein. In order to…

Q: Strain X-23 has a mutation in the lacI gene resulting in a lacI protein that cannot bind DNA.…

A: The operon model is applicable in bacterial gene regulation and some lower eukaryotes gene…

Q: What would likely result from a mutation in the lac operon promoter that increases the number of RNA…

A: RNA polymerase is the enzyme that polymerises messenger RNA (mRNA) over the DNA molecule. This…

Q: Which of the following is false when the genes of the Lac operon are being tran- scribed in high…

A: Lac operon is a set of genes used by E.coli to metabolize lactose when glucose is not available for…

Q: If tryptophan is absent from the environment of E.coli, the trp operon will be _______ A) mutated…

A: trp operon It is defined as a group of genes which encode the biosynthetic enzymes for the…

Q: 1 Given the following genotypes, explain how the mutation (identified by a () superscript will…

A: Operon is a unit  consisting of one or more systems that function coordinately under the control of…

Q: The lactose operon is likely to be transcribed when _____. A) there is more glucose in the cell than…

A: The initiation of transcription determines the regulation of prokaryotic genes. The regulation of…

Q: What is the toxin produced by E. coli O157:H7 that was encode by phage as a consequence of lysogenic…

A: E. coli is a gram-negative bacillus and some of its strains have evolved into pathogens. One of…

Q: Yeast cells are eukaryotes, and they require a functional secretory pathway to grow and to maintain…

A: Yeast are single-celled microorganisms. These are classified, along with molds and mushrooms, as…

Q: Tryptophan (Trp) attenuation is an extra mechanism of regulation of trp operon when trp level is too…

A: Attenuation is a mechanism of control of the tryptophan (Trp) operon that occurs when the level of…

Q: The lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide…

A: The lac operon is expressed at its highest levels when there is lactose but no glucose (Option C is…

Q: Determine the outcome for the lac operon genotype shown below: I*p*o°z*y /I*p*o*z°x* Assume lactose…

A: A group of genes that are transcribed under a single promoter and an operator is referred to as…

Q: inducible operon

A: Transcription: The process of copying of a segment of DNA into RNA is known as Transcription. The…

Q: 8. A mutant that has a nutritional requirement for growth is an example of a(n) A) heterotroph B)…

A: Mutation in biology is a change in the extrachromosomal genetic material, the virus, or the…

Q: Strain P77 has a mutation in the lacO that prevents it from being bound by the lacI protein.…

A: The operon model is applicable in bacterial gene regulation and also applicable in some lower…

Q: The operator of the lac operon is upstream of the gene that codes for enzymes. What does upstream…

A: Lac operon: The lac operon is a genetic regulatory system found in bacteria that controls the…

Q: Tryptophan (Trp) attenuation is an extra mechanism of regulation of trp operon when trp level is too…

A: The trp Operon, is nothing but a sequence of DNA that is responsible for the regulation of formation…

Q: Breast cancer can be caused by a genetic mutation on the BRCA1 gene changing a methionine to an…

A: BRCA 1 or Breast cancer type 1 susceptibility protein is a protein that in humans is a tumor…

Q: Which among A - D is false regarding antisense RNAs? A) O they occur in protein coding genes B) O…

A: It is a tool for preventing gene expression, they are formed by synthetic antisense…

Q: 1) Assume you have an operon that is repressible. In this case, the rate of synthesis of repressor…

A: An operon is defined as a DNA functioning unit containing a cluster or group of genes under the…

Q: If an E. coli cell is exposed to glucose, what happens? O A) CAMP levels are increased and the…

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

Q: Strain ROFL4 has a premature stop mutation in the lacZ gene, resulting in a nonfunctional…

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

Q: a)How far along the DNA would the transcription "bubble" formed by RNA polymerase move in 10…

A:

Q: E. coli expresses a specific gene in the presence of lactose. The expression of this gene is under…

A: An operon can be defined as a unit of bacterial gene expression and regulation. It includes…

Q: b) Organic matters may interfere with heat treatment of bacterial growth control. ( c)…

A: Please follow step 2 for detailed explanation.

Q: If β-galactosidase is expressed when lactose is absent, what does this suggest about the lac operon?…

A: The lac operon is a regulatory system found in bacteria that controls the expression of genes…

Q: 2) a) What would be the effect of introducing a -1 frameshift mutation into the 23S rRNA gene? .: b)…

A: A frameshift mutation is one in which a nucleotide is inserted or deleted in such a way that the…

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.