Q: Which molecules recognize the TATA box before RNA polymerase binds to the promoter region?…
A: The TATA box, also known as the Goldberg–Hogness box, is a DNA sequence present in the central…
Q: 127. Whicn of the following statement concerning the regulator gene (i) associated with the lac…
A: Answer- Lac operon operates in E.coli bacteria. It contains many set of genes arranged in a series…
Q: Name and describe two types of constitutive mutants of the lactose operon.
A: Operon can be defined as an operating unit, which is nothing but gene clusters that are located…
Q: 1. Which modification occurs as part of transcriptional termination? Explain this modification and…
A: 1 ) ANSWER The maturation of a eukaryotic mRNA from primary mrna transcript involve many complex…
Q: 9. Multiple mechanisms regulate gene expression in eukaryotes. What are the mechanisms that control…
A: Regulatory mechanisms of eukaryotic gene expression.
Q: 26) If there is no lactose present in the cell of a bacterium with a "lac operon" the repressor…
A: Operon system is an example of prokaryotic gene regulation in which the expression of polycystonic…
Q: Utilizing lactose operon, how can we explain how induction controls enzyme synthesis 2. Use…
A: An operon is a group of genes that code for proteins that are involved in a single cellular…
Q: 1.True or false: In a bacterial species with a "lac operon", the repressor protein will be bound to…
A: Prokaryotic gene regulatory system is known as operon system. In this process the expression of…
Q: How does induction control enzyme synthesis using lactose operon? 2. Describe how level of a key…
A: By controlling the transcription of the mRNA which is needed for the enzyme synthesis, the genetic…
Q: 31. In negative feedback inhibition, the ultimate product in a series of reaction inhibits the…
A: Proteins' primary function is to operate as enzymes—catalysts that speed up practically all chemical…
Q: what is an attenuator? (in context of a prokaryotic operon )
A: Operons are prokaryotic arrangements of multiple genes under the control of a single promoter. The…
Q: What is the central dogma? What are the compounds involved in this process? (Keywords: transcription…
A: A "nucleic acid" is a linear polymer of nucleotides that is a component of the cell's information…
Q: Viruses are a contributing factor in 10-20% of human cancers. Other viruses contribute to…
A: There are certain aspects in which tumor cells differ from their normal counterparts like growth…
Q: 13. Choose/mark the correct word to complete the statement. Consider the regulation of CAMP and the…
A: Operon is the segment of DNA which contains regulatory gene, promoter gene, operator gene and…
Q: 5. Regulation of bacterial operons by inducers, e.g. lactose, exhibits which of the following…
A: The regulation of gene expression can occur at the level of transcription and translation.
Q: 28) Use this model of a eukaryotic transcript to answer the following questiofn. E = exon and I=…
A: Exons- They are coding sequences present on the primary mRNA transcript as well as the mature mRNA.…
Q: 24. Use the table below to answer the following question. The template strand of a gene contains…
A: The DNA molecules are double stranded in structure . The DNA structure undergoes the process of…
Q: 3. Draw an anabolic operon with three biosynthetic genes for compound Q and a catabolic operon with…
A: ANSWER;-
Q: 4. Predict the level of genetic activity of the lac operon as well as the status of the lac…
A: In lac operon, structural genes responsible for lactose metabolism are all under the control of a…
Q: 20. In class, we discussed different types of genetic change that can cause a normal gene (proto…
A: There are two common causes of most cancers involves mutations in genes called proto-oncogenes and…
Q: Q28. Which of the following is a sequence that would be likely to be bound by a transcription…
A: Transcription factor: To initiate transcription, eukaryotic RNA polymerase requires the help of…
Q: repressible and an inducible operon
A: Operon: An operon is a functioning unit of genomic DNA containing a cluster of genes under the…
Q: 21.Trace a protein molecule from the mRNA for it leaving the nucleus to its secretion from the cell.…
A: Cytosolic protein lack N terminal signal peptide. Translation completes on free cytosolic ribosomes.…
Q: 17 Addition of the transcription factors KIf4, Sox2 and Oct4 to a fully differentiated cell, leads…
A: Cell potency is the ability of the cell to differentiate into different cell types. Similarly, stem…
Q: What statement is NOT true regarding transcription attenuation of amino acid biosynthetic operons?…
A: Amino acid biosynthesis is an anabolic process in which a molecule is synthesized as an end product.…
Q: 10. A fly gene Faf is required for eye development. The human genome has a homologous gene called…
A: Introduction A homologous gene (or homolog) is a gene passed down from a common ancestor in two…
Q: 2. What is attenuation and what is its significance in prokaryotic gene regulation? Explain…
A: Gene expression is defined as a process which is used by cells to convert the instructions coded in…
Q: 14. a. What is the role of insulators? b. What would happen if there were no boundary elements for…
A: 14 . what is the role of insulators? Insulators are the segments of DNA that functions as a…
Q: 17. NF1 protein ---- Ras signaling. a. activates b. inhibits 18. The deacetylation of the histones…
A: *NOTE: Kindly repost for other questions. Dear Student as per the guidelines we are supposed to…
Q: 15 of 22 A mutation in an enhancer for a specific gene causes it to be much less able to be bound by…
A: Here, we are given that there is a mutation in the enhancer of a gene so that it can not bind to the…
Q: 6. Which of the following is true about E. coll's lac operon? If there is no lactose present, the…
A: Option 1. For the lactose transport and metabolism of in E. coli and other bacteria, the lac operon…
Q: Which of these is found in eukaryotes but not in bacteria?
A:
Q: 10. Why does a cDNA copy of a eukaryotic mRNA gene need to be made in order to determine the…
A: Introduction :- DNA acts as the genetic material of the cell . DNA is made up of two strands , and…
Q: 13. In a eukaryote, the MRNA that will be translated is much shorter than the primary transcript.…
A: Genetic material is nothing but the sequence of nucleic acids which is called as DNA. It contains…
Q: 5. PDGF is overexpressed in certain cancers. This is an example of a mutation in the --- region. a.…
A: INTRODUCTION Answers of question 5&6 is given below.
Q: 5d. Remembering that hexose metabolism is a highly conserved process among all branches of life, how…
A: Hexose operon should contain 10 genes.
Q: Suppose you have an E. coli in which the gene that codes for the lac repressor protein has been…
A: Lac operon is an inducible type of operon that involves the breakdown of lactose in E.coli. The lac…
Q: How might the regulation of the lac operon change if a point mutation occurred that blocks the…
A: Lac Operon consists of structural (z y and a) , regulatory (I), promoter and operator genes in the…
Q: 4. wha circumstances (high or low glucose) is CAF pound CAMP? 5. In the absence of lactose and the…
A: The lactose operon, sometimes called the lac operon, is a collection of genes present in E. coli and…
Q: 1c In context with transcription of prokaryotic genes briefly describe the effect the lac…
A: Transcription within the prokaryotic cell is regulated by the complicated interactions of…
Q: 76 In positive regulation, an enhancer activates a promoter. Yes or no 77 Mutant tRNA molecules…
A: RNA molecules play an important role in many cellular processes, including encoding, decoding,…
Q: Compare and contrast repressible and inducible operons. 2. Are genes for enzymes involved in…
A: An operon is a group of genes coding for proteins that perform related functions, that are…
Q: 23. The mmm operon, which has sequences A, B, C, and D (which may be structural genes or regulatory…
A: An operon is a cluster of genes transcribed together to provide a single molecule of messenger RNA (…
Q: 4. The graph below was taken from a paper by Galardi et al., 2007, studying the role of two…
A: Introduction: P27 is an important inhibitor in the process of proliferation of cells. It inhibits…
40-How can understanding the gene expression pattern in a cancer cell tell you something about that specific form of cancer?
1-In E. coli, the trp operon is on by default, while the lac operon is off. Why do you think that this is the case?
Step by step
Solved in 3 steps
- 35. The genes shown are from the lac operon system of E.coli. The symbols a, b and c represent the repressor (I) gene, the operator (O) region, and the structural gene (Z) for β-galactosidase, although not in that order. Furthermore, the symbols written in the genotypes are not necessarily the actual sequence in the lac operon.P₁0 ORF1 t₁ ORF2 ORF3 t₂ The diagram above illustrates an operon that is regulated by the RepR protein. O A small molecule, X, is needed to enable RepR to bind to the operator (O). When X is absent, which of the following statements is most accurate? O RNA polymerase binding to the P₁ promoter is unblocked Equal amounts of ORF1, ORF2, and ORF3 are made Expression of ORF2 and ORF3 is prevented by the terminator t₁ O Expression of ORF1, ORF2, and ORF3 is de- repressed127. Whicn of the following statement concerning the regulator gene (i) associated with the lac operon is correct ? (1) MRNA is transcribed from the i-gene whether lactose is present or not. (2) MRNA is transcribed from the i-gene only when lactose is not present (3) Lactose inhibit the synthesis of mRNA from i-gene (4) Lactose promotes the synthesis of mRNA from i-gene
- 24. What statement is NOT true regarding transcription attenuation of amino acid biosynthetic operons? 1.The leader peptide will contain multiple instances of the amino acid produced by the operon. 2.Transcription attenuation will always be accompanied by other positive or negative regulatory mechanisms. 3.Trancription will be reduced under conditions where concentration of the amino acid produced by the operon is high. 4.Synthesis of the leader peptide depends on the concentration of the aminoacylated tRNA, not the amino acid directly. 5.All of these statements are true.1. Please tell me: What's a mutation in moleculer terms? 2. When a mutation deletes a base in genomic DNA, how does it affect the expression product production and reading frame? 3. How does induction control enzyme synthesis using lactose operon?amount of protein / amount of mRNA 12 mm / ↑ A B time (minutes) 20 Bacteria were grown in culture. At various time points, substances were added or removed from the culture medium. To assay the effects of the substances on operon gene expression, samples of bacteria were collected at one-minute intervals and levels of specific proteins and mRNAs were determined. If the operon under investigation is a repressible operon, which arrow indicates the addition of a molecule that binds the repressor protein?
- 15b what is an attenuator? (in context of a prokaryotic operon )4) Suppose you have an E. coli in which the gene that codes for the lac repressor protein has been mutated in such a way that the protein produced can bind to both lactose and DNA (at its specific binding site in the lac operon promoter) simultaneously. What effect, if any, would this have on regulation of expression of the lac operon? Briefly (1 sentence) explain why you would predict the effect or lack of effect this mutation would have.The a/a operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n). activator inducer repressor operator
- What is the difference between a repressible and an inducible operon?For the E. coli lac operon, when lactose is present: a. and glucose is absent, cAMP binds and activates catabolicactivator protein (CAP). b. and glucose is absent, the level of cAMP decreases. c. activated CAP binds the repressor protein to remove it from the operator gene. d. the cell prefers lactose over glucose. e. RNA polymerase cannot bind to the promoter.5 5 S 6 5 5 5 6 U 6 U 6 5:14 PM | 0.2KB/s HHHHH R R U RUUR ARU AP AP R U U R R AP R R R AP MOLECULAR...GENETICS. Describe gene regulation at transcription level. Explain the role of antsense RNA in control mechanism. Describe translational control mechanisms. Describe common DNA damages. Distinguish excision and mismatch repair. Describe the role of recA protein in recombination repair Elaborate on SOS repair mechanism. Define thymine dimer. How are they formed and repaired? Describe the molecular basis of mutation. 11 Leu+ Met+ Arg+ Write a detailed note on spontaneous mutation. Explain about mutant detection methods. Define reverse mutation. Describe the mechanism underlying Intragenic and intergenic suppressor mutations Describe the transposition mechanisms. 13 Vo LTE UNIT IV Time (Min) Describe the process of generalised transformation occurring in bacterial chromosome and plasmid. Elaborate on molecular mechanism and significance of transformation 22 Describe the process of…
