Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 14, Problem 1CQ
Summary Introduction
To determine: The difference between inducible and repressible operons.
Introduction: Inducible operon and repressible operon, both are involved at the time of the process of transcription within a cell. Small effector molecules are present in both types of operons.
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What is the difference between inducible and repressible operons?
Gene expression in bacteria is controlled by the operon model.
a) Why is the operon model important?
b) Why is the trp operon known as a repressible operon?
What is the difference between positive and negative control? What is the difference between inducible and repressible operons?
Chapter 14 Solutions
Biology
Ch. 14.1 - Prob. 1CCCh. 14.2 - Which genes are under the control of the lac...Ch. 14.2 - With regard to regulatory proteins and small...Ch. 14.2 - What were the key observations made by Jacob,...Ch. 14.2 - CoreSKILL What was the eventual hypothesis...Ch. 14.2 - Prob. 3EQCh. 14.2 - Core Skill: Connections Look back at Fig 9.12....Ch. 14.2 - What are the advantages of having both an...Ch. 14.2 - Prob. 2CSCh. 14.3 - Prob. 1CC
Ch. 14.4 - What are the two opposing effects that histone...Ch. 14.4 - Prob. 1CSCh. 14.5 - Prob. 1CCCh. 14.5 - Prob. 2CCCh. 14 - Prob. 1TYCh. 14 - Prob. 2TYCh. 14 - Transcription factors that bind to DNA and...Ch. 14 - Prob. 4TYCh. 14 - For the lac operon, what would be the expected...Ch. 14 - Prob. 6TYCh. 14 - The trp operon is considered _____ blank operon...Ch. 14 - Prob. 8TYCh. 14 - Prob. 9TYCh. 14 - _____ blank refers to the process that allows a...Ch. 14 - Prob. 1CQCh. 14 - Transcriptional regulation often involves a...Ch. 14 - Prob. 3CQCh. 14 - Discuss the advantages and disadvantages of...Ch. 14 - Discuss the advantages and disadvantages of...
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- What is an operon? Describe the functions of regulators, promoters,and operators.arrow_forwardSay you have an operon called the CAKE operon, it contains genes for the enzymes require to convert C into E via following steps C-->A-->K-->E. 1) if this operon is *inducible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the inducer molecule 2) if the operon is *repressible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the co-repressor moleculearrow_forwardSay you have an operon called the CAKE operon, it contains genes for the enzymes require to convert C into E via following steps C-->A-->K-->E. 1) if this operon is *inducible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the inducer molecule 2) if the operon is *repressible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on which is the co-repressor moleculearrow_forward
- If you add a co-eepressor to a repressor protein and that allows it to bind the operator is this a inducible, constitutive or repressible operon?arrow_forwardThe lac operon has which of the following characteristics? O 1) usually requires an activator protein bound to the promoter to be transcribed. O 2) is inactive in the presence of lactose. O 3) is active in the presence of a repressor. O 4) Is a constitutively active operator. O5) is only active in the presence of lactose.arrow_forwardWhat would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? (Explain what would happen in both the presence and absence of tryptophan)arrow_forward
- What are the major differences between an operon and a regulon?arrow_forwardWhat is an operon? How does it work?arrow_forwardDescribe what would happen to the lac operon in a low-lactose environment and in a high lactose environment. a) How will each of these environments affect gene expression? b) What would happen to the repressor in each case? c) How will each of these environments affect RNA polymerase?arrow_forward
- What are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention about the role of repressor, activator, RNA polymerase in each case! A) Glucose is absent and lactose is present B) Glucose is present and lactose is present C) Glucose is present and lactose is absentarrow_forwardWhat is an operon? Explain an inducible operon.arrow_forwardA number of mutations affect the expression of the lac operon in E. coli. Consider each genotype below and complete the table using “+” to indicate that the gene is expressed, and “−” to indicate that gene is not expressed.arrow_forward
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