Nationally Registered Certified Medical Assistant (NRCMA) (NAHP) 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

The most common bacteriology stain is?

Methylene blue

Acid-fast stain

Gram stain

Gram stain is the most common bacteriology stain as it allows for the differentiation of bacteria based on the presence or absence of a cell wall. This is particularly important in identifying different types of bacteria and their susceptibility to certain antibiotics. Methylene blue, acid-fast stain, and Congo red are all used for specific types of bacteria and are not as commonly used as the Gram stain. Methylene blue is used for staining bacteria that do not have a cell wall, acid-fast stain is used for staining bacteria that have a waxy cell wall, and Congo red is used for staining bacteria that cause meningitis. Therefore, while these may be important stains in certain situations, they are not the most commonly used stain overall in bacteriology.

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Congo red

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