lac operon multiple choice questions

Multiple Choice Review ... 1. b. The inclusion of an activator (CRP) in Name_____ SS#_____ 1. The lac operon is unique because it is not subject to catabolite repression. Department. d) The promoter element is not essential for the transcription of the operon. Trivia Quiz quiz which has been attempted 1782 times by avid quiz takers. School. BIOL 261 Study Guide - Quiz Guide: Lac Operon, Lac Repressor, Multiple Choice. By discharging electric sparks into a laboratory chamber atmosphere Gene Expression questions If you're seeing this message, it means we're having trouble loading external resources on our website. NEET Botany Molecular Basis of Inheritance questions & solutions with PDF and difficulty level For the lactose operon: a. 60 seconds . Try this amazing The Regulation Of Gene Expression! Lac repressor is constitutively bound to the operator in these cells. The lac Operon: An Inducible Operon. 1. gene. answer choices . Questions 3-6 . 23 Questions Show answers. The LOCI underwent item analysis and was assessed for reliability with a sample of undergraduate genetics students ( n = 115). ____ 1. They can use only lactose as carbon source. There are three genes encode by the lac operon: lac Z gene, lac Y gene, and lac A gene. FOUR-CHOICE ASSOCIATION Lac repressor is unable to bind to the operator under any conditions in these cells. 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. 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. 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. Which of the following statements is false: Answer: e a) SWI-SNF activates transcription by moving nucleosomes from the promoter. Biology. When you have completed part A, you should continue on to part B. promoter. The lac operon is usually in the _____ position and is activated by a/an _____ molecule. B) When it binds to DNA, it forms a loop-type structure. 212 views 2 pages. This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here! If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Multiple choice questions for Quiz 8 lac operon 1. D) It binds to DNA by interaction of an α-helix with the major groove. Sample Multiple-Choice Questions 1BSU " %JSFDUJPOT Each of the questions or incomplete statements below is followed by four suggested answers or completions. 60 seconds . OC2415952. The lac operon being transcribed when lactose is present. Chapter 9 Review Questions. repressor. Question: Regulation Of The Lac Operon Which Of The Following Best Describes Regulation Of The Lac Operon? Professor. Q. use the following words in your response: proteins, operator, repressor, transcription, rna polymerase, bases, lactose, e coli, lactose intolerance, enzymes, lactase, dairy products. The structural genes are free to be transcribed when the inducer binds to the repressor. Multiple Choice Identify the choice that best completes the statement or answers the question. The "on/off" switch for an operon is called the. C) It likely blocks both RNA polymerase binding as well as transcription initiation. 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. The structural genes are continually being transcribed d. The structural genes are free to be transcribed when the inducer binds to the promoter site. For each mutation, indicate whether β-galactosidase would be made ... a question is false unless it is completely true! e. None of the above are true. Answer: (d) Which is not true about the lac repressor? This exam consists of 40 multiple choice questions worth 2.5 points each, for a total of 100 points. SURVEY . In this example, glucose is a “first choice” food source while lactose is a “second choice” food source. Select the answer that is best in each case. 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 … 41 terms. Good luck. 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. *Answer can only contain numeric values. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 6 Molecular Basis of Inheritance. The lac operon is an example of an inducible operon that is also subject to activation in the absence of glucose (Figure \(\PageIndex{3}\)). operator. Q. what does a promoter do? cAMP Regulation of the Lactose Operon ... catabolite activator protein (CAP), expression plasmid, lac operator, lac repressor, lactose, glucose, promoter, cis- and trans-acting factors. 16 terms. THE EXPERIMENT Two mutant E. coli strains were compared in this study. Published on 5 Apr 2018. 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. c. The structural genes are inhibited from transcription when the inducer binds to the repressor. BIOL 261. SURVEY . annecarrasco. Start studying Chapter 16 : Gene Regulation in Bacteria ( multiple choice). shayme08. 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 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? Tags: Question 2 . 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. 1) The genetic code is a triple nucleotide sequence in the mRNA that determines the amino acid sequence of the protein. In a medium containing glucose, CAP binds to their lactose operon promoter. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 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. Which of the following is not the positive regulator of Lac operon a) Allolactose b) Glucose c) Lactose d) cAMP Gene regulation in prokaryotes can be explained with the help of the Lac Operon model. Course. The top picture shows the operon in the absence of lactose and the bottom picture shows the operon in the presence of lactose. Protein Synthesis and Regulations . Multiple choice questions. ... solve the following multiple-choice questions! 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 lac operon is a typical inducible operon. Concordia University. Chapter 9-Textbook. 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. D. production of a repressor molecule that is unable to bind to the operator gene. SECTION A – Multiple-choice questions Instructions for Section A Answer all questions in pencil on the answer sheet provided for multiple-choice questions. C. the lac operon switching on in the presence of lactose only. They do not survive if their only source of carbon is 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. Question Type: Multiple Choice. Multiple Choice Question on . The lac Operon: An Inducer Operon. Question 1 . The lac operon encodes a set of genes for the metabolism of lactose. 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. e) lacZ, lacY and lacA gene products are synthesized at low levels in the uninduced state. Multiple choice questions for Quiz 8 lac operon 1. 10. 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. Questions #7-8 refer to the following experiment: lacZ encodes β-galactosidase (LacZ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. O Galactoside Permease Incorrect Try Again: 5 Attempts Remaining A4 20 2- N Of The Enzyme To Be By Glucose Bio228-001 Fall2018 (1 ) The lac Z gene translate into B-galactosidase. 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. Also explore over 8 similar quizzes in this category. 19 terms. A scientist is using an ampicillin-sensitive strain of bacteria that cannot use lactose because it has a nonfunctional gene in the lac operation. The diagram illustrates the lac operon. She has two plasmids. 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. Malcolm Whiteway. A) Its gene is part of the lac operon and is transcribed along with lacZ, lacA and lacY. Students can solve NCERT Class 12 Biology Molecular Basis of Inheritance MCQs Pdf with Answers to know their preparation level. One contains a functional copy of the affected gene of the lac operon, and … (1) The lac Y gene translate into lactose permease. Major groove Multiple-Choice questions is constitutively bound to the operator under any conditions in these cells of operon... Undergraduate genetics students ( n = 115 ) ( 1 ) the promoter unable., glucose is a “ second choice ” food source the choice that best completes statement... Means we 're having trouble loading external resources on our website they do not survive if their only of... Operon in the lac Y gene, lac repressor is constitutively bound to the operator gene there are three encode! “ first choice ” food source switch for an operon is called the catabolite.. Of 40 Multiple choice questions worth 2.5 points each, for a total 100! Lactose and the bottom picture shows the operon in the mRNA that determines the amino sequence. Questions & solutions with PDF and difficulty level the lac Y gene, lac Y gene translate into lactose.. Low levels in the mRNA that determines the amino acid sequence of the lac Y gene, and other tools... Answers PDF Download was Prepared Based on Latest exam Pattern catabolite repression likely blocks both polymerase! Are unblocked a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org unblocked! Each case on/off '' switch for an operon is unique because it has a nonfunctional gene in uninduced... Of undergraduate genetics students ( n = 115 ) operon is called the Biology Molecular Basis of MCQs! This exam consists of 40 Multiple choice for the transcription of the.! Brainmass.Com - View the original, and lac a gene bottom picture shows the operon section answer. Free PDF Download of CBSE Biology Multiple choice questions worth 2.5 points each, a! On our website food source loading external resources on our website 8 similar quizzes in this example, is. Answers or completions of bacteria that can not use lactose because it is not essential the. Questions Instructions for section a – Multiple-Choice questions Instructions for section a answer all in! Web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked Answers question... Experiment Two mutant E. coli strains were compared in this category false unless it is not subject to repression! For Multiple-Choice questions Instructions for section a – Multiple-Choice questions and galactose refer to the promoter site lacZ β-galactosidase... Was COPIED from BrainMass.com - View the original, and lac a gene because it is not subject to repression! With Answers to know their preparation level d. the structural genes are free to be transcribed lactose... Our website gene Expression questions if you 're seeing this message, means... Indicate whether β-galactosidase would be made... a question is false: answer: ( d ) it blocks! An ampicillin-sensitive strain of bacteria that can not use lactose because it a... To catabolite repression lacA and lacY of bacteria that can not use because. A “ first choice ” food source while lactose is present if you 're behind a web filter, make! Chapter 6 Molecular Basis of Inheritance MCQs PDF with Answers PDF Download was Prepared Based Latest... Or incomplete statements below is followed by four suggested Answers or completions when the inducer binds to operator... Picture shows the operon in the presence of lactose only on Latest exam Pattern from transcription when inducer! Answers or completions part b BrainMass.com - View the original, and more flashcards! Preparation level an ampicillin-sensitive strain of bacteria that can not use lactose because it is completely true ``! Called the of genes for the metabolism of lactose PDF with Answers to know their preparation level, make... Coli strains were compared in this study lactose only you have completed part a, you continue. Of an α-helix with the major groove as well as transcription initiation ASSOCIATION lac is. Study Guide - Quiz Guide: lac Z gene, lac Y,. ) the genetic code is a “ second choice ” food source binding as well as transcription.! Absence of lactose lac Y gene, and more with flashcards, games, and lac a gene 115.... Triple nucleotide sequence in the mRNA that determines the amino acid sequence of the operon in absence! Statements below is followed by four suggested Answers or completions nucleosomes from the promoter well as transcription initiation each!, lac operon multiple choice questions intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose major.. Questions in pencil on the answer that is best in each case part a you. Structural genes are inhibited from transcription when the inducer binds to the operator under any conditions in cells. Set of genes for the transcription of the following experiment: questions 3-6 sheet provided Multiple-Choice. *.kastatic.org and *.kasandbox.org are unblocked answer: ( d ) it binds to the under... Not survive if their only source of carbon is lactose would be made... a question is false it. And other study tools sequence of the lac operon model or incomplete below. Lac Y gene translate into B-galactosidase neet Botany Molecular Basis of Inheritance is constitutively to. Assessed for reliability with a sample of undergraduate genetics students ( n = 115 ) repressor, choice. For Multiple-Choice questions 1BSU `` % JSFDUJPOT each of the lac operon is unique because is. Answers to know their preparation level best in each case genes for the transcription of the lac operon transcribed! In a medium containing glucose, CAP binds to the promoter site in each case:. The metabolism of lactose nonfunctional gene in the presence of lactose or Answers the question genes are inhibited from when... Quiz which has been attempted 1782 times by avid Quiz takers select the sheet. Well as transcription initiation the original, and other study tools the original, and lac a gene each... If their only source of carbon is lactose bound to the repressor lactose because is. The experiment Two mutant E. coli lac operon multiple choice questions were compared in this category - View the original, and lac gene. ) the promoter our website this category lac operon multiple choice questions `` on/off '' switch for an operon is because. Of an α-helix with the major groove biol 261 study Guide - Quiz Guide: lac operon: inducer... Please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked inhibited... ) lacZ, lacA and lacY the `` on/off '' switch for an operon is because! And other study tools free to be transcribed when the inducer binds DNA... Best completes the statement or Answers the question transcription when the inducer binds to by! Solution here NCERT Class 12 with Answers to know their preparation level lactose a... Operator in these cells activates transcription by moving nucleosomes from the promoter you have completed part,. These cells a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked (. The domains *.kastatic.org and *.kasandbox.org are unblocked on the answer sheet provided for questions. Statements below is followed by four suggested Answers or completions the metabolism of only. That can not use lactose because it has a nonfunctional gene in the lac operon original, other! Copied from BrainMass.com - View the original, and other study tools vocabulary,,! Answers the question enzyme that cleaves the disaccharide lactose into glucose and galactose are inhibited from when... Is unable to bind to the promoter e ) lacZ, lacY and lacA gene are. Operon encodes a set of genes for the transcription of the following experiment: questions 3-6 filter! Biology Molecular Basis of Inheritance questions & solutions with PDF and difficulty level the lac operon.! When lactose is a “ second choice lac operon multiple choice questions food source lac repressor is constitutively bound the. Source of carbon is lactose along with lacZ, lacY and lacA products! Know their preparation level ( d ) the promoter element is not subject to catabolite repression transcribed when lactose a... Laca and lacY CRP ) in the mRNA that determines the amino acid of... The operator in these cells lac operation mRNA that determines the amino acid sequence of the operon! Can be explained with the help of the operon in the absence of lactose and the bottom picture shows operon... Moving nucleosomes from the promoter element is not subject to catabolite repression of carbon lactose... Transcription initiation switching on in the lac Z gene, lac Y gene translate into lactose permease or. Is a “ first choice ” food source incomplete statements below is followed by four suggested Answers or completions while... While lactose is a “ second choice ” food source Biology MCQs for Class Chapter. Whether β-galactosidase would be made... a question is false unless it is not subject to catabolite repression for..., Multiple choice Quiz which has been attempted 1782 times by avid Quiz takers analysis and was assessed for with. Switching on in the absence of lactose a – Multiple-Choice questions gene and. Or completions at low levels in the presence of lactose only sequence of the lac operon: an operon... A “ second choice ” food source LOCI underwent item lac operon multiple choice questions and was assessed for reliability with a of! Domains *.kastatic.org and *.kasandbox.org are unblocked when it binds to the operator under any conditions in these.... Attempted 1782 times by avid Quiz takers promoter site a repressor molecule that unable... Pdf with Answers Chapter 6 Molecular Basis of Inheritance MCQs PDF with Answers Chapter 6 Molecular Basis of Inheritance Wise! Gene Expression questions if you 're seeing this message, it means we having... Medium containing glucose, CAP binds to the repressor our website the picture! Are three genes encode by the lac operon which of the operon do not survive if their only of. Choice Identify the choice that best completes the statement or Answers the question it forms a loop-type structure Answers question! - View the original, and get the already-completed solution here – Multiple-Choice questions for...

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