Suppose you had a bacteriophage λ in which the gene encoding the cro protein had been mutated, so that it had an unusually high affinity for pL - in this phage the first promoter repressed by cro would be pL, not pRM. What effect, if any, would this mutation, and the consequent rapid repression of transcription from pL, have on the outcome of a cell being infected by this mutant bacteriophage? Explain why you would predict that outcome of an infection by this mutant phage.

Q: A lac operon containing one mutation was cloned into a plasmid, which was introduced by…

A: the lac operon system present in bacteria

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: The Lac operon contains genes responsible for the transportation and breakdown of lactose. 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: Mutation in the operator that reduces the affinity of the operator for the repressor protein…

A: Lac operon is an inducible operon. When lactose is present in medium, then lac operon starts.

Q: Explain why large amounts of transcript result when a bacterium with a lac Operon is in a medium…

A: Transcription is the process by which RNA is synthesized from DNA. The messenger RNA or mRNA…

Q: The trpR gene encodes an allosteric protein that binds the amino acid tryptophan and regulates the…

A: Trp operon is also known as tryptophan operon. The tryptophan operon consists of structural genes,…

Q: Comparing the -10 regions of two E. coli promoters which have identical -35 regions revealed the…

A: Transcription is a process by which the information a strand of DNA is copied into a new molecule…

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: 3′-->5′ Exonuclease activity allows DNA polymerase III (Pol III) to back-up and fix a mismatched…

A: Since there are multiple questions in this particular question, I'll answer the first one for you.…

Q: Name the lambda promoters whose expression is regulated by the cro protein. For each promoter you…

A: CI represses cro and Cro represses cI. This is referred to as the double-negative feedback loop and…

Q: What event in eukaryotes serves as the "trigger" for entering the elongation phase of transcription…

A: Transcription occurs in the three steps—initiation, elongation, and termination. The elongation…

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: How does the binding of the trp corepressor and the lac inducer to their respective repressor…

A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…

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: Which of the following statements concerning the sequence of events involved in the initiation of…

A: Transcription is a process in which RNA transcript is formed from the DNA with the help of RNA…

Q: A lac operon containing one mutation was cloned into a plasmid, which was introduced by…

A: (a) The plasma i gene forms such a type of repressor that will not be able to bind the inducer.

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: Glucose absent, lactose absent     Glucose absent, lactose present     Glucose present, lactose…

A: An operon is found in bacteria and viruses as a genetic regulatory system. The gene coding for…

Q: he lac repressor and the pur repressor are homologous proteins with very similar three-dimensional…

A: Purine repressor (PurR) is a DNA-binding protein that is involved in the transcription process. Its…

Q: How could the increase in a protein that inhibits the activity of sigma-32 lead to an increase in…

A: The "molecular chaperone", dnaK, is induced upon heat shock and promotes ATP-dependent refolding or…

Q: Match the given step with the major central dogma event being referred to. The U2 snRNP binds to the…

A:

Q: The following statement occurs early in this chapter:“. . . a crucial step in the regulation of many…

A: Transcription is a process in which a sequence of DNA is transcribed into mRNA. In bacterial…

Q: What will most likely happen when the -35 element and pribnow box are mutated? a. The sigma factor…

A: -35 element and pribnow box both act as the essential part of the promoter sequence for DNA…

Q: The diagram below represents the tryptophan operon with the trp leader mRNA transcript enlarged to…

A: The trp operon is operated in most bacteria including E. coli which is a repressible operon. This…

Q: What is the role of arabinose in production of GFP protein from pGLO-transformed bacteria? O When…

A: Given: The role of arabinose in production of GFP protein from pGLO transformed bacteria.

Q: Under the following conditions, what will be occurring with the lac operon? Glucose: Present…

A: lac operon is present in E.coli and contain genes that control lactose metabolism and only active…

Q: the presence of tryptophan, and a mutation in the allosteric domain that abolishes tryptophan…

A: The trp operon is an operon that is a group of genes that is used for transcription  of messenger…

Q: A. Which operons would be functional under these conditions? lac and trp B. What repressors would be…

A: A. Which operons would be functional under these conditions? Answer - lac and trp operon.   B. What…

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: What if there was a mutation in the operator region of the lac operon and the active repressor could…

A: We are answering first 2 questions. For the remaining question pls repost.

Q: The MRNA for a mammalian peptide that enhances electrolyte transfer to reduce paralysis was spliced…

A: The cells are of two types eukaryotic and prokaryotic cells. The primary difference between the cell…

Q: Bacterial DNA containing an operon encoding three enzymes is introduced into chromosomal DNA in…

A: Prokaryotes are the organisms that lack the cell nucleus and membrane-bound organelles. They have…

Q: Which of the following is FALSE? Sigma domain 3.2 makes direct contact with the 5'-end of the…

A: Gre proteins of prokaryotes are transcription elongation factors that promote an endogenous…

Q: You are examining a set of genes from a phage that are transcribed late in infection. You know that…

A: Transcription: It is a process of synthesis of mRNA transcript from the double-stranded DNA as a…

Q: One of the main lessons of this chapter is that several bacterial genes are often transcribed from a…

A: As given: Several bacterial genes are often transcribed from a single promoter into a large…

Q: in the CTD of RNA polymerase II is phosphorylated to recruit enzymes to add the 5’ guanosine cap?…

A: During the being transcription cycle, the C-terminal domain (CTD) of the most important part of RNA…

Q: Many transcriptional activators are proteins with a DNA-binding domain (DBD) and an activation…

A: Introduction  Protein is the key biomolecule in the biological system, any important physiological…

Q: A mutant strain of E. coli has a premature stop mutation in the lacZgene, resulting in a…

A: Operon is a cluster of genes working under the same promoter. Operons are present in prokaryotes.…

Q: Why is it adaptive for the structural genes for using lactose to be under the control of a single…

A: Each cell can adjust to its surroundings to the best of its abilities. This adaptability is achieved…

Q: Contrast the effects of mutations in genes encoding sporulation-specific sigma factors with…

A: Introduction Mutation in sigma factors:- Sigma factors are subunits of all bacterial RNA…

Q: Many bacterial genes with related functions are arranged in operons, sets of contiguous genes that…

A: Transcription is the first od several steps of DNA based gene expression in which a particular…

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

A: The prokaryotic gene regulation is known as operon system which controls the expression of…

Q: The yeast gene SER3, whose product has a role in serine biosynthesis, is repressed during growth in…

A: The yeast cell consists of a cell wall and a plasma membrane. The cell wall is composed of mostly…

Q: A newly identified protein from the  cells of the Panopyra plant on Pandora was shown to inhibit…

A: Post-transcriptional regulation is an efficient way to regulate gene expression and that is used by…

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: In the: Mutation of the regulatory region for a repressor protein in the lac operon. Explain: (a)…

A: Operon  It is a set of multiple gene that is controlled by single operator.

Q: which of the following statements about the A pahge are TRUE, which ones are FALSE? Phage genes are…

A: Phage genes are repressed during the lysogenic state. Answer) False The phage has a temperate…

Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.