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Which of the following strains of influenza is most commonly associated with human flu cases each year?

While not a common staining technique, negative stains do have their uses in the Microbiology lab.  Which of the following bacteria would be best visualized using a negative stain, because of their unique natural shape?

An experienced microbiologist inoculates both Staphylococcus epidermidis and Escherichia coli into a culture medium.  After incubation, only the E. coli has grown upon the media.  What is the most likely explanation for the absence of the Staphylococcus epidermidis?

The acid-fast stain is a useful technique for the identification of bacteria that have mycolic acid (wax) in their cell walls, such as:

Basic, or cationic, dyes:

The primary difference in cell wall structures of those bacteria that we refer to as Gram-negative and those that we refer to as Gram-positive, is that: 

Graph the linear inequality.2x + 5y ≤ 10

The most common differential staining technique performed in microbiology labs around the world, used to differentiate between those bacteria that have only peptidoglycan in their cell walls and those that have both peptidoglycan and lipopolysaccharide, is the:

A patient comes to the ER complaining about a wound on their thigh that has recently turned black, forming an eschar.  After talking with the patient, you learn he is a farmhand that works with cattle and other livestock.  The doctor recommends an antibiotic prescription of broad-spectrum ciprofloxacin.  The causative agent is most likely:

What is C representing?