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- In the absence of tryptophan, the trp repressor is Group of answer choices active and can bind to the operator. active and cannot bind to the operator. inactive and cannot bind to the promoter. inactive and cannot bind to the operator.Describe how the components of the trp operon system are affected by a mutation in trpC? Why is it that once enviornmental tryptophan is inserted into the cell, only the trp repressor is activated (turned on)?Which of the following statements is false?a) A derivative of lactose serves as an inducer of the lac operon.b) Signal transduction provides a mechanism for a cell to sense the conditions of its external environment.c) Quorum sensing allows bacterial cells to sense the density of like cells.d) An example of a two-component regulatory system is the lactoseoperon, which is controlled by a repressor and an activator.e) An ORF is a stretch of DNA that may encode a protein.
- Binding of _______ to _______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. repressors; enhancersA binding site for RNA polymerase is called a ________. a. gene c. codon b. promoter d. proteinA 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
- For the lac operon, determine whether genes will be expressed (on) or silenced (off) given the following: a. Lactose levels are high, glucose is low. b. The lac repressor can no longer bind DNA; lactose and glucose are low.The lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide lactose. Therefore, the lac operon is expressed at its highest levels when there is: A) glucose but no lactose B) lactose and glucose C) lactose but no glucose D) no glucose or lactoseA mutation occurred on the lacI (repressor) gene resulting in a constant production of beta-galactosidase and permease, even in the absence of lactose. Provide an explanation for the effect of this mutation on the repressor protein molecule
- In the presence of allolactose, the lac repressor a. binds to the operator. b. binds to the promoter. c. cannot bind to the operator. d. binds to the regulator gene.If CAP is bound to the Promoter of the Lac Operon and the repressor protein is not bound to the operator, which of the following is true: a.Glucose Levels are low & Lactose is absent b.Glucose is absent & Lactose is present c.cAMP is low & Lactose is Absent d.Glucose and Lactose are Present e.cAMP is low & Lactose is presentMutation of which of these sequences would have an effect on translational initiation? A. 3’ UTR B. Polyadenylation signal C. 5’ UTR D. upstream enhancer E. TATA box
