You've Just Isolated a New Bacterium in Pure Culture, and You

question 63

Multiple Choice

You've just isolated a new bacterium in pure culture, and you culture it on a general purpose medium where its cells have a coccobacillus morphology. When you examine the cells after culturing on a variety of differential media, you ?nd that in some cases, the cells appear a coccobacillus, but in others, they can be ?lamentous, cocci, or club-shaped. The best explanation for this observation is that _______.

• A) the media were incubated at an incorrect temperature
• B) the microscope is out of adjustment
• C) the differential media are contaminated
• D) the bacterium is pleomorphic
• E) your culture has become contaminated

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Definitions:

Combination Circuit

A circuit that contains both series and parallel paths.

Series Components

Electrical components connected in a circuit in such a manner that there is only one path for current flow, causing the current through each component to be the same.

Parallel Components

Elements in an electrical circuit are said to be in parallel if they are connected across the same two points in the circuit, allowing electric current to split and flow through multiple paths.

Current Flow

The flow of electric charge carriers like electrons, through a conductor or electrical circuit.