What are the effects of the following conditions on Lac operon of bacteria? Please do not forget to mention about the role of repressor, activator, RNA polymerase in each case. Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absent

What are the effects of the following conditions on Lac operon of bacteria? Please do not forget to mention about the role of repressor, activator, RNA polymerase in each case. Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absent

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 2TYU

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A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcription
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 absent
Which of the following lac operon genotypes would allow for functional versions of all the structural enzymes of the lac operon to be expressed constitutively even in the absence of lactose? Group of answer choices I+ O+ Z+ Y+ A+ I- O+ Z- Y- A- I+ OC Z+ Y+ A+ IS O+ Z+ Y+ A+ I+ O+ Z- Y+ A+
Which of the following condition(s) is optimal for expression of the lac operon? I. low glucose and formation of CAP-cAMP complex II. high glucose resulting in no cAMP III. no lactose present and a functional repressor IV. presence of lactose binding to a functional repressor
The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) IS O+ Z+ IS OC Z+
The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) I+ OC Z+ I+ O+ Z+ (Lactose present) I- O+ Z+
If E. coli bacteria are placed in an environment that contains both glucose and lactose, the regulation of the lac operon will allow which nutrient to be processed first? Both will be processed at the same time. Neither will be processed in this environment. Lactose Glucose Not enough is known about the regulation of the lac operon to know which nutrient will be processed first.
A mutation at the operator prevents the regulator protein from binding.What effect will this mutation have in the following types of operons? Q. Regulator protein is a repressor of a repressible operon.
In the lac operon, the lacZ gene codes for an enzyme called ____________, which catalyze the breakdown of the sugar __________ into monosaccharides. This enzyme can also hydrolyze the sugar analog ____________, which produces blue pigments following its breakdown. Since the lac operon is not always on the bacterial cells, we add the chemical ________ which prevents the lac depressor from binding to the operators, leading to constitutive expression of the operon.
A bacterial cell is mutated and cannot create the repressor protein associated with the Lac operon. How will this affect the functioning of the Lac operon?
Which of the following is true about the Lac operon? Group of answer choices An operon with a constitutive operator (O^C mutation) will transcribe in the presence of a super repressor It is a positive repressible operon that is influenced mainly by fluctuations in glucose levels Produces a large quantity of tryptophan in order to synthesize lactase It is found in eukaryotes and is responsible for creating an enzyme that breaks down lactose
When lactose is first introduced into the medium, the lac operon is not induced and thus permease isn't induced. How is it possible for lactose to enter the cell before the lac operon is induced? While the lac operon is not induced yet, lactose has many different ways to get into the cells without the need of permease. While the lac operon is not induced yet, lactose breaks down outside the cell into smaller components in order to get into the cell and then the components reassemble into lactose again inside the cell so that the induction can occur. While the lac operon is not induced yet, there is always a very high level of permease and beta galactosidase in the cell. While the lac operon is not induced yet, there is full level expression most of the time which allows a sufficient amount of permease to be expressed. This allows lactose to enter the cell. While the lac operon is not induced yet, there is low level expression most of the time which…