Compare and contrast regulation by a repressor and an activator.

Q: A mutation in E. coli makes the lac operator unable to bind the active repressor. How would this…

A: Lac operon is a set of three genes present in bacteria and the genes are responsible for…

Q: Compare the structures and functions of transcriptionalactivators and repressors.

A: The transcription factors are the molecules or the chemical agents, which can bind to the promoter…

Q: Describe the function of activators and repressors.

A: Activators and repressors are the terms used for the transcription factors which are basically the…

Q: Suppose that you joined a group of scientists working on a protein which has nuclear localization…

A: Nuclear transport alludes to the mechanisms by which particles get across the nuclear membrane of a…

Q: Compare and contrast the roles of a corepressor and an inducer innegative regulation of an operon.

A: Gene regulation is the process through which the cells control the expression of genes. It controls…

Q: Predict the consequence of a mutation in the lac I repressor gene that produces repressor protein…

A: The ‘Lactose operon’ (lac operon) is a group of genes that consist of a single promoter. It is…

Q: Describe what happens to the trp operon as the cell uses up its store of tryptophan.

A: The cells have amino acids in various forms such as precursors or native form. Amino acids are an…

Q: Explain how small effector molecules affect the functions of activators and repressors.

A: Answer: Introduction: Gene expression regulation can be done by various mechanism including,…

Q: Contrast the role of the repressor in an inducible system and in a repressible system.

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: How does the Trp operon work? A. Binding of Trp to a repressor protein allows the repressor to bind…

A: Trp operon is the cluster of genes that are responsible for synthesis pf operon

Q: What are the advantages of having both an activatorand a repressor protein?

A: Gene expression is regulated by the turning off of the expression of genes when they are not…

Q: What type of control generally involves binding of a repressor protein to a regulatory DNA sequence?…

A: Repressor : DNA binding protein which inhibits the expression of 1 or more genes via the binding to…

Q: Compare and contrast how activators, coactivators, repressors,TFIID, and mediator play a role in…

A: Transcription is a process of transcribing the template DNA into complementary mRNA sequence which…

Q: Positive regulators are called: A. Repressors  B. Activators C. Enhancers D. None of the above

A: Transcription is a process by which the RNA is synthesized from the DNA sequence. RNA polymerase is…

Q: An activated eukaryotic transcription factor looks for specific:

A: Transcription is the process by which DNA is used as a template to synthesize an RNA sequence.…

Q: Describe the functions of activators and repressors.

A: The genes are the primary unit of life. The nucleotide sequence of the genes are responsible for…

Q: Describe how the trp operon is under negative control

A: Introduction  Gene Regulation: Expression of gene is highly regulated in both prokaryotes as well as…

Q: Explain how a reverse transcriptase activity within a cell can result in gene amplification.

A: Reverse transcriptase was the RNA dependent DNA polymerase enzyme where complementary DNA  was…

Q: The antagonist of the inhibitor in down regulation is called: A. repressor B. promoter C. inducer D.…

A: explanation-An decrease in the number of receptors on the surface of target cells making the cells…

Q: Differentiate inducsible and repressible operon

A: The promoter and operator control the group of genes which are called operons. Some operons are…

Q: Explain how small effector molecules affect the function of activators and repressors.

A: Small effector molecules are those molecules which affect the regulation of transcription by binding…

Q: State the concept of Isolation of the Repressor ?

A: Jacob and Monod propose a negative control strategy in which certain genes, called regulatory genes,…

Q: Would the relative position where a transcription factor or an activator/repressor binds DNA be the…

A: Transcription occurs inside the nucleus and it require the presence of enzyme rna polymerase and in…

Q: Define repressors?

A: Regulation of gene expression is the mechanism of switching off and switching on the genes depending…

Q: Explain in your own words the role of a medical transcriptionist

A: Medical transcriptionist is person who transcribing voice-recorded medical reports that are dictated…

Q: What is the function of a repressor protein?   Question 3 options:   To turn on transcription by…

A: In the genome of prokaryotes and eukaryotes there are many sequences such as structural gene…

Q: How would a mutation in E. coli make the lac operator unable to bind the active repressor to affect…

A: Numerous factors may result in mutations. Certain mutations appear to occur naturally, with no…

Q: Compare and contrast the activities of an activator protein anda repressor protein.

A: Gene regulation is a mechanism by which cells increase or decrease the productivity of any specific…

Q: Repressors bind toa) Promoterb) Enhancerc) Operatord) Hormone response element

A: A repressor is a protein that can bind to DNA or RNA and inhibits gene expression. The DNA-binding…

Q: Use the lac operon as an example to describe one way thatbacteria regulate gene expression

A: Operon is a group of genes in bacteria that are transcribed together and are under the control of a…

Q: Compare how histones and microRNA control gene expression

A: histones and microRNA control gene expression by:

Q: What are positive regulators (activators) and negative regulators (repressors)? Describe.

A: Activators and repressors are two types of gene regulators, with activators causing positive…

Q: What is known as repressible ?

A: Repressible was first documented by Ephrussi et al. in the 1930s, and it is useful for researchers…

Q: Explain the term inducer.

A: The process of transcriptional regulation is mediated by various types of regulatory proteins,…

Q: Define inducer and repressor.

A: The gene expression results in the production of a functional protein. The synthesis of protein…

Q: Explain how activators and repressors regulate operons in prokaryotes.

A: In prokaryotic cells, there are three types of regulatory molecules that can affect the expression…

Q: Explain the Structures of repressors?

A: A repressor is a protein that shows a negative effect on gene expression. They are proteins that…

Q: The binding of the inducer to the repressor causes the repressor to O bind to the operator. O stop…

A: Lac operon is a type of gene expression in prokaryotes. There are genes that code for different…

Q: With the aid of a diagram, explain feedback inhibition and feedback repression.

A: The intracellular concentration of a protein and other products is managed at a set point. There are…

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: Repressor molecules bind toa) Operatorb) Promoterc) Enhancerd) Hormone response element

A: An operon has certain regulatory sequences that help in the regulation of transcription. They can…

Q: A repressor is a __________ that _________ transcription. a. small effector molecule, inhibits b.…

A: Transcription refers to the process in which the deoxyribonucleic acid (DNA) molecule is transformed…

Q: What is a major difference between activator proteins and repressor proteins

A: Activator proteins can have binding sites for ligands (such as CAMP), but repressor proteins only…

Q: What term is used to describe the DNA sequence to which a repressor binds? attenuator operator…

A: Operon is operating units which can be defined as the cluster of genes located together on the…

Q: Explain Modular structure of activators and repressors

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

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.