What type of control generally involves binding of a repressor protein to a regulatory DNA sequence? (one or two word answer only, please)
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- in the visual system, it is critical to keep a subset of neuronal genes in a repressed state to maintain stability. Activity of which enzymes contributes to the maintenance of this state of gene repression? Question 37 options: HAT SWI/SNF HDAC RNA Pol IIThe process in which the two-dimensional structure of RNA from the L region of an operon can either prevent or allow transcription of the structural genes is called _____________. Group of answer choices Activation Co-repression Induction Attenuation RepressionAn activated eukaryotic transcription factor looks for specific:
- 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?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…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 is a major difference between activator proteins and repressor proteinsContrast the role of the repressor in an inducible system and in a repressible system.The tryptophan operon of E. coli represents an example of a gene regulatory system which is: a repressible system (normally turned on, but can be repressed) a repressible system (normally repressed, but can be turned on) an activator system (normally turned off, but can be activated) an activator system (normally activated, but can be turned off) all of the above
- A transcription repressor results in a decrease in transcription of an operon. This is an example of ____________________________. a constitutive system an inducible system positive control negative control a repressible systemIn a written paragraph, describe the difference between prokaryotic and eukaryotic TRANSCRIPTION. In your response, include the following: - differences in what structures (DNA, RNA, proteins etc...) are involved - differences in timing and location - DO NOT include any details on what happens after transcriptionFor the following types of transcriptional control, indicate whether the protein produced by the regulator gene will be synthesized initially as an active repressor or as an inactive repressor. Q. Negative control in a repressible operon