Describe how a superantigen such as toxic shock syndrome toxin can become lethal.

A mutation at the operator site of a positive inducible operon that causes the sequence of the operator to change, would result in: Group of answer choices Activator unable to bind to DNA, transcription turned on Activator binds to DNA, transcription turned off Activator binds to DNA, transcription turned on Activator unable to bind to DNA, transcription turned off

It is thought that attenuation occurs especially in a laboratory setting because nonvirulent or weakly virulent mutants grow faster in laboratory media when there is no selective advantage to virulence.   pathogens lose virulence with age and survive longer in laboratory cultures.   there is selection for more virulent strains in the laboratory.   patients can be treated with drugs that induce attenuation.

Describe the differences between the F factor and Hfr transfer. Include how the donor and recipient are affected in each type of conjugation.

Please draw a concept map using the following terms for regulation  Repressor, Inducer, Induction, Negative regulation, Repression, Operator, Positive Regulation, Activator, Sigma-32, Sensor Kinase, Two-componenet Regulation, Lac operon, Heat shock, Catabolite repression, trp operon, Feedback inhibition, Protein Stability, Sigma factors, Response regulator, Riboswitch, Homoserine Lactone, Quorum sensing, Autoinducing Peptide, RNA regulation, Antisense RNA

The increased incidence of covid-19 cases is due to the delta variant which has been found primarily to be airborne. Viruses and other microorganisms are considered to be constituents of particulate air pollutants. The DENR-EMB requires engineering tools and techniques that would significantly reduce the emission of pollutants into the atmosphere. Which of these tools and techniques would be the most appropriate for use in reducing particulate pollutants carrying covid-19 viruses? Why?