A student was given a stained smear to observe.Upon observation, the student noted rod-shaped bacteria that were clear and unstained against a darker background.What sort of stain was performed on this slide?
A)Gram stain
B)acid-fast stain
C)simple stain
D)negative stain

Question

Quizplus · Accepted Answer

A negative stain is used to color the background surrounding bacteria, leaving the bacteria clear and unstained. This matches the description given by the student in the question. Gram stain, acid-fast stain, and simple stain are all designed to stain the bacteria themselves, not the background.

A Student Was Given a Stained Smear to Observe