Which of the following is true about proteobacteria? Select all that apply. O they are gram negative O they are gram positive O they are typically classified based on their G+C content O Agrobacterium is an example of a proteobacterium O They are all pathogenic O None are pathogenic O Some genera are important members of the nitrogen cycle O They are metabolically diverse Most are extremophiles O Neisseria is an example of a proteobacterium
Microscopic examination
The analysis of minute organisms, cellular organization of any biological structure, and composition of body fluids with the help of a microscope is known as microscopic examination. The magnification of specimens or samples under study helps in attaining a clearer picture of it.
Gram Staining
Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique 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.
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