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.

A new microbe has been discovered in the rumen of sheep. Microscopy shows no evidence of a nuclear membrane and biochemical studies of the cell wall demonstrate the lack of peptidoglycan. Metabolic studies show that this microbe generates methane. This microbe would most likely be classified in ______.

A 30× objective and a 20× ocular lenses produce a total magnification of ________.

After you boiled the media in the flask to kill every living form in the swan-neck flask, you let it sit in your room for a week. In which section of the flask (shown below) would you expect to find microbes?

Who of the following developed a set of criteria that could be used to establish a causative link between a particular microorganism and a particular disease?