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

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

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

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

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?

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 ______.

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

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?

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