A Standardized Inoculum of Bacteria Is Used in All Microbiology

question 38

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:

Morpheme

The smallest significant unit of meaning in a word (e.g., the word boys has two morphemes, boy and -s).

Phoneme

The smallest significant unit of sound in a language. Alphabetic characters roughly correspond to phonemes (e.g., apt, tap, and pat are all made up of the same phonemes).

Hierarchical Structure

An organizational structure where entities are ranked one above the other based on their level of authority or importance.

Phonemes

The smallest units of sound in a language that are capable of conveying a distinct meaning.