Context: Other microscopic procedures may also aid in identifying infectious agents. Almost all cells readily stain with a number of basic dyes due to the electrostatic attraction between negatively charged cellular molecules and the positive charge on the dye. A cell is normally transparent under a microscope, and using a stain increases the contrast of a cell with its background. Staining a cell with a dye such as Giemsa stain or crystal violet allows a microscopist to describe its size, shape, internal and external components and its associations with other cells. The response of bacteria to different staining procedures is used in the taxonomic classification of microbes as well. Two methods, the Gram stain and the acid-fast stain, are the standard approaches used to classify bacteria and to diagnosis of disease. The Gram stain identifies the bacterial groups Firmicutes and Actinobacteria, both of which contain many significant human pathogens. The acid-fast staining procedure identifies the Actinobacterial genera Mycobacterium and Nocardia.

Question: What do almost all cells readily stain with?
Answer: a number of basic dyes

Question: Why do cells easily stain with dyes?
Answer: electrostatic attraction

Question: What electronic charge do cellular molecules have?
Answer: negatively charged

Question: What is Geimsa stain?
Answer: a dye

Question: How many methods comprise standard approaches used to classify bacteria and diagnose disease?
Answer: Two

Question: What do few cells readily stain with?
Answer: Unanswerable

Question: Why do cells have difficulty staining with dyes?
Answer: Unanswerable

Question: What electronic charge do cellular molecules destroy?
Answer: Unanswerable

Question: How many methods comprise unorthodox approaches used to classify bacteria and diagnose disease?
Answer: Unanswerable

Question: What is the rarest method used to classify bacteria and to diagnose a disease?
Answer: Unanswerable