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

A microscope that exposes specimens to ultraviolet, violet, or blue light and forms an image with the light emitted at a different wavelength is called a __________ microscope.

In the Gram-staining procedure, the decolorizer is __________.

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

After the decolorizer has been added, Gram-positive organisms are stained __________ and Gram-negative organisms are stained __________.

The Gram-staining procedure is an example of __________.

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

Antiseptic surgery was pioneered by _______.

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

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