The first step in identifying an organism from a pure working culture is to perform a(n) __________ test. acid-fast staining negative staining endospore staining simple staining Gram stain

Definition Definition Technique that uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.