A Public Health Microbiologist Plans to Screen a Particular Bacterial

question 46

Multiple Choice

A public health microbiologist plans to screen a particular bacterial species that was isolated from several patients in an intensive care unit to detect if any of the cells are penicillin-resistant mutants.What is the first step in conducting this experiment?

• A)Determine whether or not wild type cells of the same bacterial species are susceptible to penicillin.
• B)Test the cells to see if they can grow on media to which penicillin has been added.
• C)Perform an antibiotic susceptibility test on the cells using antibiotics other than penicillin that are known to be effective.
• D)Set up an Ames test to see if any of the isolates are mutagenic.

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Definitions:

Schedules of Reinforcement

In behavioral psychology, the strategy or pattern by which rewards are given to promote certain behaviors.

Negative Reinforcement

A behavioral principle where the removal or avoidance of an undesirable outcome strengthens the behavior leading to its avoidance.

Punishment

The application of an aversive stimulus following a response in an effort to decrease the likelihood that the response will recur.

Positive Reinforcement

A method in behavioral psychology where the introduction of a rewarding stimulus following a desired behavior increases the likelihood of its recurrence.