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

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