This constituent of a gram-positive cell wall absorbs crystal violet but is not dissolved by alcohol, thus giving the gram-positive cell its characteristic purple color.  

  Confirmation is used after  

When microbiologists set up a biochemical identification using a commercial system on a suspected pathogen from a culture, they must

What does a lysine iron agar (LIA) slant contain?

Polymicrobial presentations in smears require more interpretation and must take into account all the following, except

Gamma (g)-hemolysis is

Colonies growing on the SBA have discolored the media to a green color around and under the colonies. This is consistent with which type of hemolysis?

Biochemical tests are based on the _____ of microorganisms.

All of the following virulence factors are associated with Staphylococcus aureus, except

All of the following staphylococci are coagulase-positive, except