13. Nigrosin is a stain used in
a. simple staining.
b. gram staining.
c. negative staining.
d. acid-fast staining.

14. The stain used to identify bacteria with a large amount of peptidoglycan in their cell walls is the
a. acid-fast stain.
b. methylene blue stain.
c. Gram stain.
d. negative stain.

15. Which of the following stains is generally used for the diagnosis of tuberculosis?
a. Acid-fast stain
b. Gram stain
c. Negative stain
d. Simple stain

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