Remember that hexose kinase is an enzyme required for hexose metabolism, a process that takes a6-carbon sugar and breaks it down into 2 pyruvate molecules.You discover that rather than being hormonally regulated (as seen above in humans), hexose kinaseis part of an operon in prokaryotic organisms. This operon is known as the "hexose operon" and itregulates expression of the complete set of enzymes needed to convert a hexose sugar into 2pyruvate molecules.Like the lac operon, the hexose operon is controlled by a separate regulatory protein under the controlof its own promoter (see the schematic of the operon below). The hexose regulatory protein issensitive to fatty acyl CoA levels. When all hexose fuel sources are depleted, the bacteria switch tolipid metabolism and fatty acyl COA levels increase. This turns expression of the hexose operon off.+1+1Regulatory GenePregulatorPoroperonHexose Operon Genesregulator promoteroperon promoterQuestion 5E) The regulatory protein that controls expression of the hexose operons is a transcriptionalACTIVTOR or REPRESSOR (circle one).

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Description: Remember that hexose kinase is an enzyme required for hexose metabolism, a process that takes a6-carbon sugar and breaks it down into 2 pyruvate molecules.You discover that rather than being hormonally regulated (as seen above in humans), hexose kin

Answered: E) The regulatory protein that controls…

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E) The regulatory protein that controls expression of the hexose operons is a transcriptional ACTIVTOR or REPRESSOR (circle one).

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 13TYU: INTERPRET DATA Develop a simple hypothesis that would explain the behavior of each of the following...

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Imagine that a new strain of E. coli is discovered, and it contains the following novel genetic region including the lacI gene and the lac operon: *see image* Upstream of the promoter associated with the lac operon, there is a new operator element "Oν" (O-"nu"). This new operator has high sequence homology to O1, the DNA element that is bound with the highest affinity by the lac repressor. What would be the impact of this new genetic element regarding behavior of the operonin the absence (vs. the presence) of lactose and allolactose? Answer in terms of the protein levels of the lac repressor, as well as the proteins encoded by the genes lacZ/Y/A in the downstream region of the operon. Remember that proteins, once expressed/generated, will not persist forever, and that they have a natural lifetime (ending when they are degraded by the cell).
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?
Arginine is one of the amino acids that serves as a building block for protein synthesis. Arginine biosynthesis depends on the expression of the arg operon, which encodes ArgC (a reductase) and ArgB (acetylglutamate kinase). Which of the following statements regarding mutation of the arginine biosynthesis repressor ArgR is true? O A 1-bp insertion in the argR gene would result in a mutant able to grow in the absence of arginine, O A 1-bp deletion in the argB gene would result in a mutant unable to transcriptionally regulate the arg operon encoding argB. O A 1bp insertion in the argC gene would result in a mutant able to grow in the absence of arginine. O A 1-bp deletion in the argR gene would result in a mutant that represses the arg operon when grown in the presence of arginine. None of the above.
You are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan. Using your knowledge of operons and their regulation, answer the following questions using the dropdown menus provided in Canvas. Which operons would be functional under these conditions? What repressors would be made? (NOTE: name the repressors using their gene names) Which repressor(s) would be made in the inactive form? Which repressor(s) would be made in the active form? Which repressor(s) under these conditions can bind the operator sequence? Which repressor(s)under these conditions cannot bind the operator sequence? What effect does lactose have on the bacterial cell’s lac operon? What does the absence of glucose do to the bacterial cell? You now add tryptophan to the cell. What would happen to the bacterial cell and its trp operon? What kind of regulation does lactose provide to an operon’s…
In addition to observing similarities to the lac operon, you also notice that this gene is regulated via attenuation, similar to the trp operon. Based on this similarity to this model operon, you could state that ___________. Group of answer choices If a terminator loop forms in the DNA, the expression of the structural genes is halted. The formation of the terminator hairpin followed by a series of Uracil (UUUUUUU) functions similar to Rho-Independent termination to result in the stopping of transcription. The transcription of a leader sequence affects the translation of the structural genes. Never mind – all of these statements are true! Attenuation will be the primary means of transcriptional regulation, with a repressor used as a back up option.
Suppose you are studying the regulation of a gene involved in the metabolism of two nutrients, Llamasin and Alpacalon, in bacteria. You are trying to determine if these nutrients act as inducers in their operons. The following data were collected from your experiments. Which of these operons is most similar to the lac operon? Explain. Nutrient Levels of nutrient in growth medium Level of transcription of genes in operon Llamasin low high high low Alpacalon low low high high Highlight one in green: Llamasin Alpacalon Explanation:
Describe the probable genetic defect that abolishes the sensitivity of the lac operon to the absence of glucose when other metabolic operons continue to be sensitive to the absence of glucose.
You are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan. Using your knowledge of operons and their regulation, Please explain so I can understand in the answer What effect does lactose have on the bacterial cell’s lac operon? What does the absence of glucose do to the bacterial cell? You now add tryptophan to the cell. What would happen to the bacterial cell and its trp operon? What kind of regulation does lactose provide to an operon’s repressor?
Consider the trp operon found in E. coli. You have discovered a mutant strain of E.coli that contains a mutation in its trpR gene. This mutation prevents the trpR protein from binding to its small effector molecule. What would happen if both the wild type and mutant bacteria were put in an environment that contained lots of tryptophan? The normal (wild type) bacteria would have (i)________expression of the trp operon while the mutant bacteria would have (ii) _________ expression of the trp operon. A) (i) high (ii) high B) (i) low (ii) low C) (i) high (ii) low D) (i) low (ii) high
For the following questions, describe the expression levels of the structural genes in the Trp operon under the conditions described. In the absence of tryptophan, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of tryptophan, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the absence of tryptophan and the promoter sequence was mutated such that the RNA polymerase can no longer bind, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of tryptophan and the promoter sequence was mutated such that the RNA polymerase can no longer bind, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the absence of tryptophan and the trpR repressor gene is mutated such that the…
For the following questions, describe the expression levels of the structural genes in the Trp operon under the conditions described. In the absence of tryptophan, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of tryptophan, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the absence of tryptophan and the promoter sequence was mutated such that the RNA polymerase can no longer bind, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"]
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