A Standardized Inoculum of Bacteria Is Used in All Microbiology

question 47

Multiple Choice

A standardized inoculum of bacteria is used in all microbiology labs when performing a Kirby-Bauer assay. This standard allows for a visual turbidity reading to achieve reproducibility in the number of bacteria inoculated on a plate. This is most important because

• A) multiple antibiotics testing requires that bacteria be spread evenly around the plate.
• B) the MIC value can only be achieved by serial dilutions.
• C) the number of organisms placed on an agar surface is inversely proportional to the size of the zone of inhibition.
• D) bacterial counts need to be the same across all labs, since incubation times can differ.
• E) bacterial counts need to be the same across all labs, since plate sizes in this assay can differ.

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Definitions:

Psychosis

A mental disorder where thought and emotions are so impaired that contact is lost with external reality.

Paranoia

A psychological state in which individuals experience false beliefs of being persecuted, unnecessary feelings of jealousy, or an inflated sense of self-worth.

Depression

A mental health disorder marked by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities.

Psychosomatic

Referring to physical symptoms that are caused or significantly influenced by psychological factors, such as stress or anxiety.