In the Gram-staining procedure, the counter stain is __________.

The Gram-staining procedure is an example of __________.

The endosymbiotic hypothesis is generally accepted as the origin of eukaryotic organelles.

Antiseptic surgery was pioneered by _______.

If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be _________.

Invisible living creatures were thought to exist and cause disease long before they were ever observed.

If you forgot to apply the safranin stain while performing a Gram stain, which outcome would you expect?

Prior to staining, smears of microorganisms must be heat-fixed in order to __________.

Who is credited with developing and documenting the first vaccination procedure against smallpox?

The instrument that produces a bright image of the specimen against a dark background is called a/an ________ microscope.