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