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

question 76

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 rod-shape (bacillus) morphology.In addition to culturing it on solid media, you inoculate a slide to grow it as a biofilm.When you use confocal microscopy to image the biofilm, you observe that there are several cellular morphologies, ranging from coccus to coccobacillus to long bacillus.The best explanation for this observation is that

• A)the confocal microscope is out of adjustment.
• B)the biofilm is no longer a pure culture of the microbe.
• C)the biofilm culture was not incubated under the appropriate conditions.
• D)the microenvironments within a biofilm promote structural variation.

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Definitions:

Standard Labor-Hours

The expected amount of time that it should take to produce one unit of a product or complete a process.

Fixed Overhead

Indirect costs that do not vary with the level of production or sales, such as rent, salaries, and insurance.

Budget Variance

The difference between budgeted or planned financial activity and the actual financial performance.

Fixed Overhead

Costs that do not change with the level of production or business activity, such as rent, salaries of permanent staff, and insurance.