Certain environmental conditions such as exposure to UV light areknown to activate lysogenic λ prophages and cause them to progressinto the lytic cycle. UV light initially causes the repressor protein to be proteolytically degraded. Make a flow diagram showing the subsequent events that lead to the lytic cycle. (Note: The xis gene codes for an enzyme that is necessary to excise the λ prophage from the E. coli chromosome. The enzyme integrase is also necessary for this excision.)

Q: The map of the lac operon is shown below. Consider the following examples that include both haploids…

A: Lac operon is the segment of DNA which includes regulatory gene, structural gene, promoter gene and…

Q: Can you please help me by drawing a serie of schematic figures that demonstrates the information in…

A: Proteins undergo post-translational modifications to increase their functional diversity. The…

Q: in in Below is a schematic diagram showing a 3000 bp region of yeast genomic DNA. TSS 5' +1 (i) Draw…

A: Unlike prokaryotic RNA Pol., eukaryotic RNA Pol. II cannot initiate the transcription by itself.…

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

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

Q: Pegard to bacteriophage lambda's decision to enter the lytic or lysogenic cycle, which of following…

A: INTRODUCTION A bacteriophage, or phage for brief , is a virus that infects bacteria. Like other…

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: Match each of the following to cis-acting or trans-acting. If you are in doubt, try drawing out a…

A: Operon is a set of structural genes in a bacterial cell, along with common promoter and other…

Q: Where does the prion protein come from?

A: Some infectious particles do not follow the cell theory and might lack one or the other essential…

Q: Researchers have successfully used gene therapy toameliorate some human genetic diseases by adding…

A: Gene therapy is a process in which normal copies of genes are introduced into cells, where they can…

Q: As shown a genetic switch that controls the choicebetween the lytic and lysogenic cycles of phage λ.…

A: Bacteriophages are the viruses that infect bacteria. They have two replication pathways: the lytic…

Q: Suppose you had a bacteriophage λ in which the gene encoding the cro protein had been mutated, so…

A: The mutation alters allele frequencies by constantly introducing new alleles, which can be…

Q: What would be the effect on X inactivation of adding siRNAs that eliminated the products of each of…

A: X-inactivation is the process in which one of the X-chromosome in females is inactivated…

Q: The cI protein in bacteriophage l (lambda) is a transcriptional regulator - name the promoters in…

A: cI is a transcription inhibitor of bacteriophage Lambda. It is also known as Lambda Repressor and is…

Q: . For each of the following growth conditions, whatproteins would be bound to lac operon DNA?…

A: An operon consists of many related genes that are regulated by a common operator. The multiple genes…

Q: Why is it reasonable that eukaryotes have aDNA polymerase (Pol ) that operates only in…

A: Introduction: DNA is a type of nucleic acid that is present in the nucleus of the cell. It is the…

Q: Explain what is c-myc translocation and why it results in overexpression of c-myc. What is the role…

A: Epstein-Barr virus or EBV is one of the most common viruses found in the human body. They pass from…

Q: CHOICES: Isoniazid Rifampicin Ethambutol None of the Choices Causes more adverse effects to…

A: The correct option is Rifampicin. Rifampicin: • Causes optic neuritis. Explanation-…

Q: UVTA encodes a DNA repair protein and is regulated by LexA. Which of the following could be…

A: The uvrA gene codes for the repair protein and is negatively regulated by the LevA gene.  The LevA…

Q: Lac Repressor A Operator Lac Y eene Promoter Lac Z eene Lac A gene В Lac Y eene Lac A gene Promoter…

A: Lac operon consists of a group of genes that codes for a protein that allows bacteria to use lactose…

Q: When 1 million cells of a culture of haploid yeastcarrying a met− auxotrophic mutation were plated…

A: Mutations can cause a novel mutant allele to revert to wild type in a process called reverse…

Q: Before the integration of a transposon, its transposasemakes a staggered cut in the host target DNA.…

A: Introduction Deoxyribonucleic acid (DNA) is a polymer made up of two polynucleotide chains that coil…

Q: fluctuating Proteolytic cleavage is used to inactivate repressors in an essentially process, such as…

A: Proteolytic cleavage is basically the process of breaking the peptide bonds between amino acids in…

Q: .  Locate the -10 region hexanucleotide sequence in the following coding strand of DNA.  Indicate…

A: Transcription is a process through which the template strand of the DNA transcribes into mRNA in the…

Q: Oncogenes sometimes result from genetic rearrangements(e.g., translocations) that produce gene…

A: The normal growth and functions of human cells are primarily based on the information stored in each…

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: 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: Generation of induced pluripotent stem (iPS)cells was first accomplished using retroviral vectors…

A: Induced pluripotent stem cells that are also referred asiPSCs are generated only from…

Q: Suppose multiple mutations occur in the U1 snRNA. Which step mechanism would be directly impaired? O…

A: The processing of mRNA (messenger ribonucleic acid) includes the addition of a 5’ cap composed of…

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 figure above shows a schematic of genes and transcription control elements from phage λ. Use…

A: The figure above shows a schematic of genes and transcription control elements from phage λ. The…

Q: A bacterial cell undergoes a change and the two Trp codons of the tryptophan leader sequence are…

A: Tryptophan operon is an example of repressible operon which remain transcriptionally active and…

Q: The promoters on genes encoding early proteins in viruseslike T4 have a different sequence than the…

A: Virus is a microorganism that is smaller when compared to a bacterium. They lack the ability to…

Q: Bacteriophage lambda is integrated in DNA of a host cell, which is exposed to UV light in a body of…

A: Lambda phage's life cycle is regulated by various repressors and regulators  Such as cll and cro…

Q: nexose kinase gene's sequence can be found below, the +1 nucleotide is ed. It also contains an…

A: Replication occurs in three major steps: the opening of the double helix and separation of the DNA…

Q: When environmental conditions are optimized for promoting cellular growth, which statements are…

A: Bacteriophages are viruses which infect bacteria.They are obligate intracellular viruses.They have a…

Q: Many viruses that infect eukaryotic cells express genes that alterthe regulation of host gene…

A: Cluster of microRNA (miR)183 This miR family, which consists of miRs-183, -96, and -182, also is a…

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: You are working with a bacterial lysogen and have decided to induce lysis. What needs to happen for…

A: Viruses are an obligate intracellular parasites. Some viruses are temperate phages that have to…

Q: The symbols a, b, and c in the table below represent theE. coli lac system genes for the repressor…

A: Answer a. a = lacO; b = lacZ; c = lacI .   Explanation: You've been told that a, b, and c stand for…

Q: Several new genes in the SOS regulon were identified by an ingen- ious use of “Mud" phages. These…

A: SOS it is a DNA repair system.

Q: would a mutation in E. coli make the lac operator unable to bind the active repres

A: Three genes collectively known as the lac operon are found in bacteria, and they are in charge of…

Q: Which of the followings is/are regulated by proteolytic cleavage?

A: Proteolytic cleavage is the process through which proteolytic activation of an enzyme occurs. The…

Q: Repressor protein controlling own regulation in Lamda lysogenic cycle, justify with the following…

A: Lambda phase is a virus which have ability to infect bacteria like e.coli , it is also known as…

Q: The following diagram describes the mRNA sequenceof part of the A gene and the beginning of the B…

A: mRNA is a transcribed by the process of transcription from the template DNA strand that codes for…

Q: Retroviral reverse transcription occurs in: O The nucleocapsid O The cytoplasm O The nucleus The…

A: When retrovirus infect a cell, it's envelope is left outside the cell. Only the capsid containing…

Q: Repressors are inactivated either by interaction with a small-molecule inducer or by proteolytic…

A: Lac Operon operates in bacteria. It allows the expression of proteins responsible for the catabolism…

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…

Q: Would this circular DNA molecule be found in an F+ or F− cell?

A: Conjugation is merely the merger of two bacterial cells that are compatible. The equivalent to…

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.