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