Promoters are DNA sequences a. near a transcription start site b. bound to a repressor protein c. that inhibit transcription of a gene d. that stimulate ncRNA activity
Q: Which of the following are possible reasons that a cell would regulate its expression of a gene?…
A: Gene expression is defined as the process or method by which the encoded information in a specific…
Q: What is the effect of high levels of glucose on the lac operon?a. Transcription is stimulated.b.…
A: An operon is found in bacteria and viruses as a genetic regulatory system. The gene coding for…
Q: The splicing process a. occurs in prokaryotes. b. joins introns together. c. can produce…
A: Ribonucleic acid (RNA) is a nucleic acid found in both the nucleus and cytoplasm. It can be genetic…
Q: Sigma (σ) factor is needed during which stage(s) of transcription? a. Initiation c. Termination b.…
A: Transcription is the first step in central dogma of protein synthesis. It involves formation of…
Q: In eukaryotes, activator proteins bind to what type of DNA sequence? O A) terminators O B) enhancers…
A:
Q: In gene silencing, the “dicer” enzymea. assembles siRNAs into a RISC complex.b. unwinds the RISC…
A: Introduction: Gene silencing is a mechanism to regulate the expression of genes. The gene silencing…
Q: Alternate splicing: A. Reduces mRNA half-life by shortening poly(A) tails B. Disrupts histone…
A: Introduction In Molecular Biology, RNA Splicing Is The Process By Which A Newly Synthesised…
Q: Select the descriptions that are specific for a general transcription factor Select 2 correct…
A: Correct options are: Option A i.e. transcription factor can act to repress or activate a certain…
Q: Through alternative splicing, eukaryotes (a) reinforce gene inactivation (b) prevent transcription…
A: The transcriptional process of genes has some differences in prokaryotic cells and eukaryotic cells.…
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: 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: A down promoter mutation causes the promoter of a gene to be_______ like the consensus sequence and…
A: For gene expression, the promoter is the most essential element, since it is the DNA…
Q: Which of the following phrases does not describe a function of the promoter? a. Serves as sequence…
A: DNA transcription is the process of the formation of messenger RNA(mRNA) from DNA. The genetic…
Q: If you want to express a eukaryotic gene in a bacterial cell, you ned to (select all that apply):…
A: The gene is a basic physical and functional unit of heredity. Genes are made up of DNA.The gene is a…
Q: Operons______ . a. only occur in bacteria b. include multiple genes c. involve selective gene…
A: The correct answer is (b) include multiple genes
Q: Define and describe the roles of the following in transcription: a. transcription factors b. RNA…
A: Transcription is the process where the information in a DNA strand is copied and interpreted into a…
Q: Which of the following is least related to the other items? A. RNA Polymerase B. transcription…
A: Transcription It is defined as the process of production of RNA sequence from the DNA sequence. The…
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: All are stages in transcription EXCEPT: A chain termination. B DNase I activity on RNA…
A: Transcription is the process of conversion of RNA to proteins. It involves 3 steps initiation…
Q: A mutation in one gene that reverses the phenotypic effects of amutation in a different gene isa. an…
A: A mutation is a change that occurs in deoxyribonucleic acid (DNA) sequence during the process of…
Q: Which one is not a part of the transcription unit? a) RNA primase b) Promoter c) RNA coding sequence…
A: Deoxyribonucleic acid (DNA) is a double stranded helical genetic material containing thousands of…
Q: Assembly of transcription initiation complexes is mainly controlled by
A: Assembly of transcription initiation complex is a process of bringing together all the components…
Q: Describe the process of transcription in prokaryotes
A: Since you have asked multiple questions we will answer the first question for you. If you want any…
Q: A binding site for RNA polymerase is called a .a. gene c. codonb. promoter d. protein
A: Transcription is a process in which one strand of DNA known as template strand is known as converted…
Q: In the trp operon, what happens to the trp repressor in the absence of tryptophan? a. It binds to…
A: An operon refers to a group of functionally-associated genes that are controlled by a shared…
Q: Which of the following is true regarding General transcription factors? a. Act at every gene for a…
A: Transcription factors are proteins which binds to DNA, resulting in regulation of gene expression…
Q: Proteins that increase the efficiency of RNA polymerase binding to the promoter are called O…
A: Gene expression is increased with binding of RNA polymerase to gene promoter and then initiate…
Q: Cytopathic effects (CPE) are visible changes in cells due to: A)viral infection B)mutations…
A: Cytopathic effects are structural changes in a cell which can be easily viewed under a compound…
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: How do repressors reduce transcription of an operon? A) recruit RNA polymerase to promoters B)…
A: Repressors are the proteins that has a negative effect on the expression of gene. These are those…
Q: A scientist is interested in producing flowers with a darker red color. To do this, the scientist…
A: Si RNA is a small interfering or silencing RNA, which is a non-coding, double stranded RNA molecule.…
Q: a. What is grey donut shaped object supposed to represent? b. Label with the word "promoter" where…
A: Transcription is the first step of the central dogma, it is a process where an RNA transcript is…
Q: . If a particular operon encodes enzymes for makingan essential amino acid and is regulated like…
A: An operon is a functional unit of DNA (Deoxyribonucleic acid) including a gene clusters under the…
Q: Which of the following is an example of positive control? (a) transcription occurs when a repressor…
A: A positive control is described as an integral part of an experimental that has a tendency to…
Q: Which diagram shows a system in which the lac operon genes are NOT going to be transcribed by the E.…
A: The prokaryotic gene expression is regulated by operon system that involves expression of polycystic…
Q: In eukaryotic cells, transcription cannot begin until(A) the two DNA strands have completely…
A: The deoxyribonucleic acid (DNA) is the hereditary material that transmits the genetic information…
Q: Mechanisms that govern gene expression do not operate during______ . a. transcription c. translation…
A: Gene expression is a process in which a gene is expressed into a gene product. A gene is a piece of…
Q: how does the E.coli RNA polymerase find the gene's promoter to be transcribed? A. the TATA…
A: The transcription of DNA into RNA is catalyzed by DNA dependent RNA polymerase enzyme. There are…
Q: General transcription factors Select an answer and submit. For keyboard navigation, use the up/down…
A: The general transcription factors bind to other proteins or to a sequence element within the…
Q: Which of the following is not a reason that gene transcription is selective (occurs on specific…
A: Transcription is the process of formation of an RNA transcript from a DNA as a template. It takes…
Q: Predict the effects of deleting the following regions of DNA: (a) The gene encoding lac repressor…
A: DNA : It is the chemical name for the molecule that carries genetic instructions in all living…
Q: n prokaryotes, the sigma factor recognizes base sequences in the which facilitates RNA polymerase…
A: Sigma factors play a key role in the regulation of gene expression in response to changing…
Q: A regulatory transcription factor protein typically contains _________ that binds to the ________ of…
A: Transcription is the first step in central dogma of protein synthesis. It involves formation of…
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: A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous…
A: In bacteria and their viruses, an operon is a genetic regulatory structure in which genes coding for…
Q: Binding of______ to_______ in DNA can increase the rate of transcription of specific genes. a.…
A: Transcription is a process in which one strand of DNA known as template strand is known as converted…
Q: A scientist identifies a potential transcription regulation site 300bp downstream of a gene and…
A: Introduction Proteins are the key biomolecule in the biological system, any important physiological…
Q: Which feature of promoters can be found in both prokaryotes and eukaryotes? a. GC box b. TATA box c.…
A: Transcription is a process by which the information a strand of DNA is copied into a new molecule of…
Q: Transcription factors a. help the RNA polymerase bind DNA b. are involved in chromatin remodeling,…
A: Introduction “Transcription Is The Process Of Gene Expression That Involves The Synthesis Of RNA…
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.
Promoters are DNA sequences
a. near a transcription start site
b. bound to a repressor protein
c. that inhibit transcription of a gene
d. that stimulate ncRNA activity
Step by step
Solved in 2 steps
- After treating cells in tissue culture with an HDAC inhibitor, which of the following is the most likely outcome? A. Repression of transcription B. Promoter methylation C. Enhanced splicing D. Activation of transcription E. Depends on the cell typeE. coli are grown on a medium containing lactose. Once glucose is added to the medium, the bacteria stop fermenting lactose. Which of the following BEST explains the observed effect? A. Cellular levels of cAMP are lowB.Glucose is bound to the promoter C. Repressor protein is bound to the operator D. Repressor protein is bound to the promoterDefine the following terms: a. promoter b. consensus sequence c. operon d. chromatin-remodeling complex e. general transcription factors
- Which of the following is not true regarding gene regulation that involves DNA bending? a. The precise distance between the regulatory sequence and the promoter is important. b. Effect can be to repress transcription c. Effect can be to activation transcription d. Regulated genes can be thousands of base pairs away from the regulatory sitesAssembly of transcription initiation complexes is mainly controlled by? a. Promotors b. Activators c. Repressors d. Suppressors e. B & CWhich statement/s is/are TRUE about transcription?A. During transcription, DNA polymerase binds to RNA and separates the DNA strands.B. RNA polymerase uses one strand of DNA as a template to assemble nucleotides into a strand of RNA.C. RNA polymerase binds only to DNA promoters, which have specific base sequences.D. Promoters are signals in RNA that indicate to RNA polymerase where to begin transcription.E. Transcription occurs in the 3’ to 5’ direction with respect to the growing mRNA strand.
- Choose the item in column 2 that best matches each item in column 1. A. Provides information for production of protein B. Binds to promoter C. Promoter has a box A and box B consensus sequences D. Autocatalytic RNA molecules E. Associated with transcription termination F. Polymerization of ribonucleotides to form RNA molecules G. 7-methyl guanosine H. MRNA prior to processing select - 1. Core RNA polymerase select 2. rho (p) factor select 3. hnRNA select - 4. RNA select -5. RNA polymerase holoenzyme select 6. Ribozymes select - 7. 5' MRNA cap select 8. MRNAIn the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainDefine and describe the roles of the following in transcription: a. transcription factors b. RNA polymerase c. promoter d. sigma factor e. enhancer f. TATA box
- What is one function of TFIIH during transcription? a. Recruiting the TATA-box binding protein to the TATA-box. b. Terminating transcription via factor-dependent termination. c. Capping the 5' end of mRNA with 7-methylguanylate. d. Phosphorylating the CTD of RNA polymerase.E. coli has five genes that code for enzymes that make tryptophan. These genes are regulated by a single promoter and transcribed as one long gene. The presence of tryptophan shut down the production of tryptophan by the cell by binding to the repressor. This changes the repressors shape allowing it to bind to DNA operator, blocking RNA polymerase and cutting off the production of tryptophan. a. Describe what woud happen to the operon if some of the cells had a mutation on the repressor, not allowing it to bind with tryptophan. The repressor is described as an allosteric protein. What does this mean? b. Does the tryptophan model demonstrate an inducible or repressible operon? What is your evidence? *What are two reasons that a eukaryotic gene (e.g. Green Fluorescent Protein in jellyfish) will not be expressed if it is inserted into a bacterial genome with no alterations? a. Bacterial genes do not contain introns b. Bacterial promoters have different consensus sequences than eukaryotic ones c. Transcription of this gene is affected by the simultaneous processes of transcription and translation d.