The lac operon is strongly transcribed when which of the following sugars are present in the growth medium? What is the correct option from the choices below? Lactose and glucose Lactose alone Lactose and arabinose a and b, but not c b and c, but not a

The lac operon is strongly transcribed when which of the following sugars are present in the growth medium? What is the correct option from the choices below? Lactose and glucose Lactose alone Lactose and arabinose a and b, but not c b and c, but not a

Name: The lac operon is strongly transcribed when which of the following sug
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Description: The lac operon is strongly transcribed when which of the following sugars are present in the growth medium? What is the correct option from the choices below?Lactose and glucoseLactose aloneLactose and arabinosea and b, but not cb and c, but not a

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 11TYU

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Consider this strain of E. coli with lac operon alleles: IS pt o* z* y+ /T p* oCz- Y+ In a written response, briefly explain if beta-galactosidase AND permease will be expressed, and if so, will they be inducible or constitutive.
Which of the following statements about the lactose operon in E. coli is TRUE? It contains the genes that encode the proteins for lactose metabolism. Its transcription is blocked when allolactose binds to the lac repressor. It contains a promoter, an operator and an attenuator. It is barely transcribed, when lactose is present in the medium and glucose is absent. It is transcribed at very high levels, when lactose is absent, and glucose is present.
Which of the following is the true inducer of the lac operon? galactose glucose lactose CAMP allolactose Ⓒ
Under which of the following conditions would a lac operon produce the greatest amount of β-galactosidase? The least? Explain your reasoning. Lactose present Glucose present Condition 1 Yes No Condition 2 No Yes Condition 3 Yes Yes Condition 4 No No
what is the nature and likely location(s) of a mutant that would, 1)allow constitutive expression of the lac gene? 2)prevent the cell from responding to lactose ( genes are not induced when exposed to lactose)? 3) not allow the cell to utilize lactose even when the genes are induced
It has been postulated that thiogalactoside transacetylase (LacA in the lactose operon) plays a role in detoxification by acetylating potentially hazardous -galactosides to prevent their absorption after they have diffused out of the cell. How would you put this idea to the test?
Which of the following conditions is most likely to result in an increase rate of transcription of the lac operon? when lactose is present AND the repressor is permanently attached to the operator when lactose is present and there is high levels of glucose when lactose is absent and there are low levels of glucose when lactose is present and there are low levels of glucose
Under which of the following conditions would a lac operon produce the greatest amount of B-galactosidase? The least? Explain your reasoning. Lactose present Glucose p Condition 1 Yes No Condition 2 No Yes Condition 3 Yes Yes Condition 4 No No
Use the blanks on the left hand side to put the following statements in order (use numbers or letters to designate the order). All of the statements refer to the diauxic (sequential) growth of a bacterium on the carbon substrates glucose and lactose (see textbook Fig 4.11 on diauxic growth). Remember, the lac operon contains the genes necessary for the lactose catabolism. The glucose substrate is completely consumed, at which time the repressor protein on the lac operon unbinds from the DNA molecule. The lactose substrate is catabolized by the active B-galactosidase enzyme. Glucose, as the preferred carbon substrate, is first consumed by catabolic enzymes that are constitutive (always present). After completion of translation, the B-galactosidase enzyme undergoes folding to form into an active enzyme that can breakdown lactose into its constituent monosaccharides. The messenger RNA code from the lac operon is translated by ribosomal RNAS to form lac-related enzymes, such as…
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
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A constitutive mutation in the lac operon may be of several types. [Note that constitutive means that the structural genes are always expressed, even if lactose is absent.] Name two types of constitutive mutations. Group of answer choices LacY- and LacI- LacOc and LacZ- LacZ- and LacI- LacY- and LacA- LacI- and LacOc