[MidA] Marie, a behavior analyst, arranges several types of…

[MidA] Marie, a behavior analyst, arranges several types of activities in front of her client Leon. Leon picks one toy and plays with it. Marie then returns the toy to the group and rearranges the toys in a new order for Leon to choose from again. Marie records which toy Leon selects each time and identifies his preferred toy. What type of preference assessment method is Marie using?

A patient is diagnosed with a Pseudomonas aeruginosa infecti…

A patient is diagnosed with a Pseudomonas aeruginosa infection that demonstrates resistance to multiple antibiotic classes. Genetic analysis reveals the presence of multi-drug resistant transporters (MDRs). Which of the following best explains this resistance mechanism?