Which of the following statements about the lac operon is correct? 1. lacZ, lacY and lacA proteins are translated using the same MRNA molecule. 2. Lacl is a gene that codes for allolactose. 3. Allolactose activates transcription of lacz, lacY and lacA. 4. In the presence of lactose, the repressor is active. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3, and 4 are correct.

Q: How does tryptophan regulates its own production? a. When tryptophan levels are high, it binds to…

A: Tryptophan: In order to build proteins, bacteria such as Escherichia coli E.coli need amino acids.…

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

A: The lac operon stands for lactose operon. These are a set of genes that are found in E.coli and…

Q: Where does allolactose, the inducer of the lac operon, bind? a. to the operator O b. to the…

A: Lqc operon is the set of genes responsible for the metabolism of lactose in Ecoli . The lac operon…

Q: As trytophan levels increase in the cell, _____ bind(s) to active aporepressors, causing ______ of…

A: trp operon:  The trp operon codes for the components required for tryptophan production. An operon…

Q: c. spore d. all of the above e. none of the above 4. Concerning the lac operon, activation of the…

A: Q.4. The lac operon is necessary for lactose transport and processing in E. coli and other…

Q: Which of the following is true of operons?a. They consist of a coordinated set of genes, all of…

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

Q: Geneticists isolated six trains of E. coli (strains 1-6) whose lac operons had one of the following…

A: LAC operon of E. coli is an example of inducible gene expression system. Lactose acts as inducer…

Q: β-globin gene indicate that some areas are more sensitive than others. When mutations occur in…

A: Promoter is a sequence in the DNA where RNA polymerase recruites itself. It is a very crucial region…

Q: Which of the following statements about gene regulation is false?   a. An operon contains DNA…

A: Introduction Gene expression is the process in which the genetic information present in the DNA…

Q: Which of the following elements of the lac operon and its associated regulatory factors function in…

A: One of many types of functional regulatory elements are cis-regulatory modules. Regulatory elements…

Q: An operon a. is regulated by a repressor binding at the promoter. b. has structural genes that are…

A: When the RNA polymerase binds to the promoter, the operon is transcribed and some mRNAs are…

Q: Which of the following statements uses the term homologous correctly?A. The two X chromosomes in…

A: Homologous genes refer to the genes that are inherited in two species by a common ancestor. These…

Q: Geneticists isolated six trains of E. coli (strains 1-6) whose lac operons had one of the following…

A: Lac operon It is an operon that is needed for the movement and metabolism of lactose in E. coli.

Q: Which of the following statements correctly describes promoters in E. coli a.A promoter may be…

A: A promoter is a short region of DNA upstream of the start site of a gene at which the RNA Polymerase…

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: The presence of _____ in the medium prevents CAP from binding to theDNA, resulting in _____ in…

A: CAP is the catabolite activator protein. It binds to a DNA region before the promoter of the lac…

Q: In the lac operon, how would gene expression be affected if each one of the following segments was…

A: The lac operon is basically a group of genes with a single promoter whose genes encode proteins that…

Q: Prokaryotes are lacking. in their DNA sequence. A. introns B. exons. O C. promoter sites D. operons

A: Prokaryotes are the primitive type of cells that don't have membrane bound organelles and have the…

Q: Components necessary for regulating the /trp/ operon do NOT include

A: Answer - Option E - CAP protein

Q: The lac operon is controlled by two main proteins. These proteins a. both act in a negative…

A: The lac (lactose) operon functions during the transcription and translation of genes required for…

Q: Which of the following is true?   a.     Enhancers are proteins that bind to activator DNA…

A: An enhancer is a brief piece of DNA (50–1500 bp) in genetics that can bind to proteins (activators)…

Q: You grow bacteria in media where the only carbon source is lactose (rich lactose media). Which of…

A: Introduction- Lysogen is defined as the strain of bacteria affected by a virus, i.e., a phage that…

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

A:

Q: How does the lac operon regulate lactose digestion in bacteria?a. The repressor protein becomes a…

A: The lac operon of E. coli contains genes concerned with lactose metabolism. It's expressed only if…

Q: What is the role of a substrate that controls a repressible operon?   a. increase the production…

A: Operon is the segment of DNA. It consists of structural genes, regulatory, promoter and operator…

Q: A scientist compares the promoter regions of two genes. Gene A’s core promoter plus proximal…

A: Promoters are nucleotide sequences location upstream of a gene. They serve as sites where proteins…

Q: The transcription initiation factor “recruited” together with RNA-Pol II in the formation of…

A: Transcription is a process of making an RNA copy from a gene’s DNA sequence. This is known as…

Q: One strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene…

A: One strategy for producing a protein in the milk of a cow is toplace the coding sequence of the gene…

Q: Operons encoding catabolic enzymes are often _______, while those encoding anabolic enzymes are…

A: Answer - Option B - Activated by their enzymatic substrate; inhibited by the presence of their…

Q: Eukaryotic transcription has the following regulatory upstream element (region) in addition to…

A: In Eukaryotic transcription, the cells undergo several steps for copying genetic information present…

Q: How does exposing an E. coli cell to glucose affect the regulation of the lac operon via CAP? a.…

A: Catabolite activator protein (CAP) impacts the expression of the lac operon based on the catabolites…

Q: What is the direction of the growth of newly synthesized RNA chain during transcription?   options:…

A: The first step of gene expression is transcription. A protein subunit or a polypeptide making…

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: In a bacterial operon, the active repressor bind to the   A. promoter.   B. terminator.   C.…

A: The operon concept can be defined as a DNA containing a set of genes that are transcribed basically…

Q: The lac operon controls lactose metabolism in bacteria. Predict the phenotype of a LacP mutation. •…

A: Gene regulation is defined as any type of changes occur in the genes resulting in various…

Q: Eukaryotic cells have multiple complex mechanisms for the regulation of gene expression, but a…

A: Answer :- a) Operons Explanation - Eukaryotic genes aren't organized into operons, therefore every…

Q: Operons involved with the biosynthesis of molecules such as amino acids are most likely to be…

A: A repressible operon encodes for anabolic enzymes. The genes that encode these anabolic enzymes tend…

Q: A drug inhibits positive regulation of an operon. What is the most likely outcome? a. No mRNA…

A:

Q: Which of the following regions of the DNA is transcribed by RNA polymerase AND is “understood” by…

A: Transcription  Transcription is the process where DNA is transcribed into RNA with the help of…

Q: The effect that allolactose has on LacI is a. causing it to block binding of the CAP protein. b.…

A: Operons are clusters of genes in prokaryotes which are under the regulation of the same promoter…

Q: The TATA box binding protein binds to the TATA box. What is the DNA sequence of this region of the…

A: TATA box is a DNA sequence.

Q: which of the following is true regarding SLI? a. Contains the TATA binding protein  b. Binds first…

A: SL1 or Selective factor 1 is a transcription factor.  SL1 binds to the promoter of the gene. RNA…

Q: You are studying a bacterial plasmid that contains 3 operons and 9 genes. How many transcriptional…

A: In bacteria, similar and related genes are often found in a cluster on the chromosome, where they…

Q: Which of the following is true about operons?   A. Contains a cluster of genes transcribed as…

A: An operon is a functional unit of transcription and genetic regulation, which occur primarily in…

Q: Which of the following DNA elements or proteins would you expect to find only in some cells in a…

A: Enhancers are defined as cis-acting DNA sequences that can increase the transcription of genes.…

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.