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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- Most bacterial repressor proteins are allosteric. Which of the following binds with the repressor to alter its conformation? A) promoter B) corepressor C) ATPE. coli are grown on a medium containing lactose. Once glucose is added to the medium, the bacteria stop fermenting lactose. Which of the following BEST explains the observed effect? A. Cellular levels of cAMP are lowB.Glucose is bound to the promoter C. Repressor protein is bound to the operator D. Repressor protein is bound to the promoterPositive repressible means the regulatory protein is a(n) ______, and the operon is ______ when the signal is absent. Group of answer choices repressor; active repressor; inactive activator; inactive activator; active
- Regarding the tryptophan operon in bacteria, in the presence of tryptophan, tryptophan binds to the Group of answer choices Operon Operator Repressor Promoter RNA polymeraseWhat detection method could be used to determine the Mutation of the operator region that binds a repressor in a gene locus and what results could be achieved from that?The 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 Repression
- What is a major difference between activator proteins and repressor proteinsA mutation in which of the following would still allow RNA polymerase to bind to promoters but would prevent the formation of an open complex? Question 4 options: TFIIB Mediator TFIIH TFIID TBPWhich of the following is an example of positive control? (a) transcription occurs when a repressor binds to an inducer (b) transcription cannot occur when a repressor binds to a corepressor (c) transcription is stimulated when an activator protein binds to DNA (d) a and b (e) a and c
- Which of the following is true? a. Enhancers are proteins that bind to activator DNA sequences. b. Activators are proteins that bind to insulator sequences c. Repressors are proteins that bind to enhancer DNA sequences. d. Repressors are proteins which bind to silencer DNA sequencers.Before inserting the blunt-ended PCR amplicon to a dephosphorylated vector, the amplicon is treated with kinase (which adds phosphate groups). What is the rationale behind this kinase step?Is the regulator protein that binds to the operator of this operon a repressor (negative control) or an activator (positive control)? Explain your reasoning.