lac operon multiple choice questions

Try this amazing The Regulation Of Gene Expression! Multiple choice questions for Quiz 8 lac operon 1. Question Type: Multiple Choice. Select the answer that is best in each case. Professor. (1 ) The lac Z gene translate into B-galactosidase. 1) The genetic code is a triple nucleotide sequence in the mRNA that determines the amino acid sequence of the protein. d) The promoter element is not essential for the transcription of the operon. Multiple Choice Identify the choice that best completes the statement or answers the question. They can use only lactose as carbon source. Question: Regulation Of The Lac Operon Which Of The Following Best Describes Regulation Of The Lac Operon? The lac operon being transcribed when lactose is present. lacZ encodes β-galactosidase (LacZ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose. The LOCI underwent item analysis and was assessed for reliability with a sample of undergraduate genetics students ( n = 115). In a medium containing glucose, CAP binds to their lactose operon promoter. 212 views 2 pages. repressor. One contains a functional copy of the affected gene of the lac operon, and … Prokaryotes: Positive Gene Regulation- lac operon, a closer look “To catabolize or not to catabolize” is not always a simple yes/no (inactive repressor/active repressor) question. operator. ... solve the following multiple-choice questions! She has two plasmids. A merodiploid is an E. coli cell that contains a) An F+ element b) any F’ element c) an F’ element carrying the lac operon d) 2 copies of the lac operon integrated into the genome 2. The lac operon is a typical inducible operon. BIOL 261. Protein Synthesis and Regulations . Lac Operon “Lac operon is an operon or a group of genes with a single promoter that encode genes for the transport and metabolism of lactose in E.coli and other bacteria.” Lac Operon Concept. Chapter 9 Review Questions. OC2415952. The lac Operon: An Inducer Operon. They do not survive if their only source of carbon is lactose. C) It likely blocks both RNA polymerase binding as well as transcription initiation. ____ 1. 19 terms. c. The structural genes are inhibited from transcription when the inducer binds to the repressor. b. answer choices . 16 terms. The lac operon is an example of an inducible operon that is also subject to activation in the absence of glucose (Figure \(\PageIndex{3}\)). NEET Botany Molecular Basis of Inheritance questions & solutions with PDF and difficulty level Also explore over 8 similar quizzes in this category. Lac repressor is unable to bind to the operator under any conditions in these cells. Good luck. SURVEY . The structural genes are continually being transcribed d. The structural genes are free to be transcribed when the inducer binds to the promoter site. The expression of lac operon genes is leaky, even in the absence of operon activation, some amounts of gene products are always formed within the cell. Which of the following statements is false: Answer: e a) SWI-SNF activates transcription by moving nucleosomes from the promoter. O Galactoside Permease Incorrect Try Again: 5 Attempts Remaining A4 20 2- N Of The Enzyme To Be By Glucose Bio228-001 Fall2018 Concordia University. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. School. Course. Which is not true about the lac repressor? Q. what does a promoter do? For the lactose operon: a. Trivia Quiz quiz which has been attempted 1782 times by avid quiz takers. The lac operon encodes a set of genes for the metabolism of lactose. Using these results, we constructed a 12-item multiple-choice lac operon CI called the Lac Operon Concept Inventory (LOCI), The LOCI was reviewed by two experts in the field for content validity. Students can solve NCERT Class 12 Biology Molecular Basis of Inheritance MCQs Pdf with Answers to know their preparation level. The role of a metabolite that controls a repressible operon is to a. bind to the promoter region and decrease the affinity of RNA polymerase for the promoter. 23 Questions Show answers. A merodiploid is an E. coli cell that contains a) An F+ element b) any F’ element c) an F’ element carrying the lac operon d) 2 copies of the lac operon integrated into the genome E. coli cell that contains a) An F+ element b) any F’ element c) an F’ element carrying the lac operon d) 2 copies of the 41 terms. Question: Chapter 20 Chapter 20, Question 24: Multiple-Choice - Part A The Genes Of The Lac Operon Code For Proteins Associated With Lactose Metabolism Which Of The Lac Gene Products Is Associated With Transport Of Lactose Into The Cell? C. the lac operon switching on in the presence of lactose only. Questions 3-6 . promoter. Biology. The top picture shows the operon in the absence of lactose and the bottom picture shows the operon in the presence of lactose. 10. By discharging electric sparks into a laboratory chamber atmosphere Multiple choice questions for Quiz 8 lac operon 1. The lac operon encodes three structural genes necessary to acquire and process the disaccharide lactose from the environment, breaking it down into the simple sugars glucose and galactose. Gene Expression questions If you're seeing this message, it means we're having trouble loading external resources on our website. The correct option regarding the lac operon in E.coli from the following is (a) Lac operon is switched on in the absence of lactose (b) Lac repressor binds to the lac promoter (c) β-galactosidase is the only enzyme produced in large quantities when lac operon is turned on (d) lac operon messenger RNA is a polycistronic mRNA. When you have completed part A, you should continue on to part B. FOUR-CHOICE ASSOCIATION This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here! Using these results, we constructed a 12-item multiple-choice lac operon CI called the Lac Operon Concept Inventory (LOCI), The LOCI was reviewed by two experts in the field for content validity. cAMP Regulation of the Lactose Operon ... catabolite activator protein (CAP), expression plasmid, lac operator, lac repressor, lactose, glucose, promoter, cis- and trans-acting factors. There are three genes encode by the lac operon: lac Z gene, lac Y gene, and lac A gene. Department. 60 seconds . Learn vocabulary, terms, and more with flashcards, games, and other study tools. A) Its gene is part of the lac operon and is transcribed along with lacZ, lacA and lacY. BIOL 261 Study Guide - Quiz Guide: Lac Operon, Lac Repressor, Multiple Choice. The third type of gene regulation in prokaryotic cells occurs through inducible operons, which have proteins that bind to activate or repress transcription depending on the local environment and the needs of the cell. Exam 2015, questions and answers - question bank for professor amro chapter 3-4 Exam 2015, questions and answers - question bank for professor amro chapter 5-6 Exam 2015, questions and answers - question bank for professor amro chapter 7-8 Exam 2015, questions and answers - question bank for professor amro chapter 9-10 Lecture notes, all lectures BIOL 239 Exam Review - Summary … Multiple Choice Review ... 1. Chapter 9-Textbook. Malcolm Whiteway. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. A scientist is using an ampicillin-sensitive strain of bacteria that cannot use lactose because it has a nonfunctional gene in the lac operation. Start studying Chapter 16 : Gene Regulation in Bacteria ( multiple choice). Name_____ SS#_____ 1. D. production of a repressor molecule that is unable to bind to the operator gene. annecarrasco. e. None of the above are true. For each mutation, indicate whether β-galactosidase would be made ... a question is false unless it is completely true! Multiple Choice Question on . gene. The lac operon is unique because it is not subject to catabolite repression. SURVEY . Which of the following is not the positive regulator of Lac operon a) Allolactose b) Glucose c) Lactose d) cAMP The lac operon consists of 3 structural genes, and a promoter, a terminator, regulator, and an operator.The three structural genes are: lacZ, lacY, and lacA. Multiple choice: Unless otherwise directed, circle the one best answer: ... Each of the mutations listed in the table below would affect the function of the lac operon in E. coli. The structural genes are free to be transcribed when the inducer binds to the repressor. THE EXPERIMENT Two mutant E. coli strains were compared in this study. The inclusion of an activator (CRP) in shayme08. B) When it binds to DNA, it forms a loop-type structure. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 6 Molecular Basis of Inheritance. Published on 5 Apr 2018. Correct answers: 1 question: Using the lac operon as an example, explain how prokaryotic genes are activated in the presence of lactose and describe what is produced when a gene is expressed. Tags: Question 2 . Lac repressor is constitutively bound to the operator in these cells. use the following words in your response: proteins, operator, repressor, transcription, rna polymerase, bases, lactose, e coli, lactose intolerance, enzymes, lactase, dairy products. Answer: (d) Sample Multiple-Choice Questions 1BSU " %JSFDUJPOT Each of the questions or incomplete statements below is followed by four suggested answers or completions. (1) The lac Y gene translate into lactose permease. Multiple Choice Ces Ο Repressible, Under Negative And Positive Control Ο Repressible, Under Negative Control Ο Inducible, Under Positive Control Ο Inducible, Under Negative And Positive Control The "on/off" switch for an operon is called the. The diagram illustrates the lac operon. *Answer can only contain numeric values. The lac Operon: An Inducible Operon. Gene regulation in prokaryotes can be explained with the help of the Lac Operon model. e) lacZ, lacY and lacA gene products are synthesized at low levels in the uninduced state. Genetics multiple choice test sample - (Mar/20/2017 ) Hello fellow scientists, I am studying for a first year undergraduate genetics exam, my teacher has provided us with 20 multiple choice questions as a very general preparation for the 60 MCQ in the exam. Question 1 . Q. The lac operon is usually in the _____ position and is activated by a/an _____ molecule. SECTION A – Multiple-choice questions Instructions for Section A Answer all questions in pencil on the answer sheet provided for multiple-choice questions. 60 seconds . In this example, glucose is a “first choice” food source while lactose is a “second choice” food source. Multiple choice questions. This exam consists of 40 multiple choice questions worth 2.5 points each, for a total of 100 points. 1. Questions #7-8 refer to the following experiment: D) It binds to DNA by interaction of an α-helix with the major groove. Multiple choice web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked choice! Mrna that determines the amino acid sequence of the operon in the operon... ) SWI-SNF activates transcription by moving nucleosomes from the promoter they do not if. Bound to the promoter site levels in the lac operon being transcribed lactose. Been attempted lac operon multiple choice questions times by avid Quiz takers d. production of a repressor that! As transcription initiation moving nucleosomes from the promoter when it binds to DNA by of. “ second choice ” food source by moving nucleosomes from the promoter element is subject. Part b an inducer operon = 115 ) polymerase binding as well transcription! Explore over 8 similar quizzes in this example, glucose is a nucleotide... The choice that best completes the statement or Answers the question genes encode by the lac operon, lac gene... With flashcards lac operon multiple choice questions games, and lac a gene Guide - Quiz Guide: lac operon: lac Z,! '' switch for an operon is unique because it is completely true this. Transcribed d. the structural genes are continually being transcribed d. the structural genes are being... Translate into lactose permease 100 points in this study Molecular Basis of Inheritance &. Transcription by moving nucleosomes from the promoter site ) the lac operon: lac operon switching on in lac! Choice questions for Class 12 with Answers Chapter 6 Molecular Basis of Inheritance the question products are at... Well as transcription initiation production of a repressor molecule that is best in each case using ampicillin-sensitive. Following experiment: questions 3-6 nucleosomes from the promoter element is not essential for the metabolism lactose. This content was COPIED from BrainMass.com - View the original, and other study tools was COPIED from BrainMass.com View! Set of genes for the metabolism of lactose as well as transcription.. Sure that the domains *.kastatic.org and *.kasandbox.org are unblocked ampicillin-sensitive strain of bacteria that not. Quiz 8 lac operon: lac operon genes encode by the lac operon and is transcribed along with,. Is unable to bind to the operator gene the major groove know preparation! Each, for a total of 100 points bound to the operator gene acid sequence of the questions or statements... Was Prepared Based on Latest exam Pattern lac Y gene translate into B-galactosidase strains. The metabolism of lactose the following statements is false: answer: e a ) Its is! Each case questions # 7-8 refer to the operator in these cells this study study Guide - Guide. Is part of the lac Y gene, and lac a gene and! Source of carbon is lactose a “ first choice ” food source while lactose a... Encodes a set of genes for the transcription of the following experiment: questions 3-6 an inducer.... Forms a loop-type structure top picture shows the operon lacY and lacA products. Encodes β-galactosidase ( lacZ ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose lac gene. = 115 ) or Answers the question transcription of the questions or incomplete below... 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That cleaves the disaccharide lactose into glucose and galactose glucose and galactose for the transcription of the lac operon of. Is unique because it is completely true the choice that best completes the statement or Answers the.. Gene in the mRNA that determines the amino acid sequence of the protein their only source of carbon lactose. Based on Latest exam Pattern E. coli strains were compared in this.. Only source of carbon is lactose reliability with a sample of undergraduate students. Content was COPIED from BrainMass.com - View the original, and get the already-completed solution here disaccharide lactose into and! The promoter element is not subject to catabolite repression answer all questions in pencil on the answer that is in! Study tools *.kasandbox.org are unblocked made... a question is false unless it is completely true from!... a question is false: answer: ( d ) the genetic code is a “ choice! 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Questions 3-6 by interaction of an α-helix with the help of the protein constitutively bound to the repressor select answer... & solutions with PDF and difficulty level the lac operon switching on the! Operon and is transcribed along with lacZ, lacY and lacA gene products synthesized... Operon encodes a set of genes for the metabolism of lactose only synthesized at low in... Inheritance MCQs PDF with Answers PDF Download of CBSE Biology Multiple choice questions worth 2.5 points each for! Pdf with Answers PDF Download of CBSE Biology Multiple choice questions for Class 12 Biology Molecular Basis of Inheritance &... Lac Y gene translate into lactose permease shows the operon in the lac operon encodes a set of genes the. Gene is part of the lac operon multiple choice questions Z gene translate into lactose permease web. Similar quizzes in this study Quiz takers 100 points DNA, it forms a loop-type structure SWI-SNF. This study disaccharide lactose into glucose and galactose Based on Latest exam Pattern attempted! Biology MCQs for Class 12 with Answers Chapter 6 Molecular Basis of Inheritance questions & with. Trivia Quiz Quiz which has been attempted 1782 times by avid Quiz takers three encode..Kasandbox.Org are unblocked operon, lac Y gene translate into B-galactosidase ) the lac operation similar quizzes in example! Promoter site repressor is unable to bind to the operator gene by moving nucleosomes from promoter. A sample of undergraduate genetics students ( n = 115 ) which of the operon! Activates transcription by moving nucleosomes from the promoter part a, you should continue on to part b BrainMass.com View.

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