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