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

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: Which of the following gene expression regulatory mechanisms saves the most energy but takes the…

A: Gene expression can be described as a process by which the genetic information stored in the gene is…

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

A: Gene regulators are divided into two categories: activators and repressors, with activators…

Q: Promoters and Enhancers Are the Major cis-Acting Regulatory Elements

A: Regulatory genes are the genes meant for controlling the function of structural genes. The important…

Q: Describe three ways that the function of a regulatory transcription factor can be modulated.

A: Gene is a functional unit of heredity. A gene is a sequence of nucleotides in genome that codes for…

Q: Which of the following combinations will cause transcription to be activated? a. A repressor plus an…

A: The transcription is a process through which information in the DNA molecule is transcribed into…

Q: What is the advantage of using the neo gene to disrupt the function of a gene in knockout mice? a.…

A: Answer- Neo gene is amino 3'- glycosyl phosphotransferase which acts as a selectable marker in…

Q: describe Threshold effects in gene regulation

A: A gene is a short stretch of nucleotides present on a chromosome or DNA molecule, that codes for the…

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: 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: Insulators may exert their effect by a. acting as a barrier to changes in chromatin structure. b.…

A: Insulator sequences are the cis-regulatory DNA sequences that protect the gene from inappropriate…

Q: The repressor molecule, specified by the regulator gene, prevents the structural genes from…

A: Transcription is a process of formation of messenger RNA from DNA by the enzyme RNA polymerase.…

Q: Combinatorial control refers to the phenomenon that a. transcription factors always combine with…

A: Among the given options, option(b) is the most appropriate."Combinatorial control refers to the…

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: What is the effect of an increased Cro concentration on the expression of the gene for the λ…

A: The lytic cycle is the rupture of the host cell, resulting in the release of a number of viruses.…

Q: Describe how a regulatory transcription factor binds to a regulatory element.

A: Transcription is the first step in central dogma of protein synthesis. It involves formation of…

Q: Distant regulatory sites are called

A: During gene transcription some  regulatory genes are attached to the transcription site which…

Q: A researcher has just identified a new protein in bacteria that binds DNA near the promoter of a…

A: DNA (deoxyribonucleic acid) was discovered by Friedrich Miescher. Nucleotides are the structural…

Q: Distinguish between the cis-acting regulatory elements referred to as promoters and enhancers.

A: The machinery of the transcription has two major components, which are trans-acting and cis-acting…

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: What are the major differences between a repressor protein anda riboswitch in the control of gene…

A: The riboswitch acts as a regulatory mechanism of translation process, which resembles as an…

Q: chromodomains? a) b

A: Answer Chromodomain bind methylated histone tail and are associated with repression.

Q: An enhancer is a _____________ that ___________ the rate of transcription. a. trans-acting factor,…

A: Transcription is the first step in central dogma of protein synthesis. It involves formation of…

Q: Define repressors?

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

Q: Which of the following is NOT a description of an epigenetic modification? A. regulatory patterns…

A: Changes in gene expression that are not produced by changes in DNA sequences but are caused by…

Q: In a suppressor interaction, produce(s) a protein complex that is 1 mutation, active . 1 mutation,…

A: Any change or alteration to the composition of DNA other than recombination of the DNA is called a…

Q: In the presence of allolactose, the lac repressor a. binds to the operator. b. binds to the…

A: Lac operon is present in E coli, and its function is lactose metabolism. It comprises of 3 genes…

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: Identify the eukaryotic level of gene regulation. Choose the correct answer below. a. Pre-…

A: INTRODUCTION Eukaryotic level of gene regulation include epigenetic, transcriptional, post…

Q: Explain how a regulatory transcription factor exerts its effects via TFIID or mediator.

A: Transcription is a process in which the nucleotide sequences of a gene are transcribed into the mRNA…

Q: Write a short essay describing which types of trans-acting proteins bindto which type of…

A: Transcription is the process where RNA is synthesized from DNA. RNA template is then used to…

Q: Enzymes that have binding sites for modulators are specifically called a. zymogens b. quaternary…

A: An enzyme modulator can be defined as a substance that binds to a receptor to change the receptor's…

Q: Define inducer and repressor.

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

Q: An activator is to an enhancer as a(n) ____ is to a silencer. Mediator Repressor Inducer…

A: Silencers are DNA sequences that can bind transcription regulators known as repressors. DNA carries…

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: 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: You are growing E. coli in a laboratory in order to study their operons. The growth media you are…

A: The bacterial gene transcription is regulated by the operon system that regulates the expression of…

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: The regulator protein that acts on a negative repressible operon is synthesized as a. an active…

A: Operons consist of multiple structural genes grouped together with a promoter and an operator along…

Q: Compare and contrast regulation by a repressor and an activator.

A: Genes are sequences of DNA. Genes undergo transcription to synthesize RNA, and RNA undergoes…

Q: Transcription factors include ______________.   a. silencers and enhancers     b. promoters and…

A: DNA is the genetic material and made of adenine, guanine, thymine, and cytosine. DNA makes up the…

Q: What are the advantages of having multiple types of promoters and enhancers?

A: Promoter sequences are DNA sequences that define where transcription of a gene by RNA polymerase…

Q: What occurs when the appropriate signals turn on the promoter?

A: A promoter is a DNA sequence towards which proteins attach to start the process of transcription of…

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.