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