1. Describe which enzymes are required for lactose and tryptophan metabolism inbacteria when lactose and tryptophan, respectively, are (a) present and (b)absent.2. Contrast positive versus negative regulation of gene expression. Describe therole of the repressor in an inducible system and in a repressible system.

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Description: 1. Describe which enzymes are required for lactose and tryptophan metabolism inbacteria when lactose and tryptophan, respectively, are (a) present and (b)absent.2. Contrast positive versus negative regulation of gene expression. Describe therole of

Tryptophan is aa that is required for proper newborn growth as well as the formation and maintenance…

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Describe which enzymes are required for lactose and tryptophan metabolism in bacteria when lactose and tryptophan, respectively, are (a) present and (b) absent. Contrast positive versus negative regulation of gene expression. Describe the role of the repressor in an inducible system and in a repressible system.

Describe which enzymes are required for lactose and tryptophan metabolism in bacteria when lactose and tryptophan, respectively, are (a) present and (b) absent. Contrast positive versus negative regulation of gene expression. Describe the role of the repressor in an inducible system and in a repressible system.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter16: Regulation Of Gene Expression

Section: Chapter Questions

Problem 2TYK: For the E. coli lac operon, when lactose is present: a. and glucose is absent, cAMP binds and...

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1. a)how is it possible for such drugs to selectively kill bacterial cells and not our own cells? b)Provide an example of post-translational regulation of protein activity and explain the advantage of regulating each protein/process at the post-translational level instead of the transcriptional level.
1. Contrast positive versus negative regulation of gene expression. Describe the role of the repressor in an inducible system and in a repressible system.
For the E. coli lac operon, when lactose is present: a. and glucose is absent, cAMP binds and activates catabolicactivator protein (CAP). b. and glucose is absent, the level of cAMP decreases. c. activated CAP binds the repressor protein to remove it from the operator gene. d. the cell prefers lactose over glucose. e. RNA polymerase cannot bind to the promoter.
Answer the equivalent question for the trp operon: how would a mutation that prevents the Trp repressor from being made affect the regulation of the trp operon?
The a/a operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n). activator inducer repressor operator
1. Explain why catabolite repression is used in regulating the lac operon anddescribe how it fine-tunes B-galactosidase synthesis. 2.
2) Name and describe two types of constitutive mutants of the lactose operon.
1. Compare and contrast repressible and inducible operons. 2. Are genes for enzymes involved in anabolic processes usually repressible or inducible , why?
1. How does induction control enzyme synthesis using lactose operon? 2. Describe how level of a key metabolite [tryptophane] controls the gene function using tryptophane operon
1. Compare the control of gene regulation in eukaryotes and prokaryotes in termsof:a. transcriptionb. regulatory mechanisms and its components 2. Explain the evolutionary significance of mutations.
1.- Outline the general process of transcription (dna->rna) include a diagram a) include the basic enzymes involved and a description of their actions b) what is the product of transcription c)what will the cell do with the product d)where does the transcription take place in prokaryotic cell
1. A)Explain the mechanism by which the lac operon is sensitive to glucose levels (presence and absence of glucose). B)If glucose levels in the cell are high and lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?