Label and describe the function of each indicated part of the compound light microscope.
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Which of the following is/are true regarding our normal microbiota? Select all that apply.

a. Our normal microbiota is easily disrupted by hygiene practices like hand washing.

b. Our normal microbiota can include pathogens.

c. Normal microbiota compete with pathogens.

d. Normal microbiota may colonize us before we are even born.

e. Normal microbiota changes over time.

f. The normal microbiota that we have as adults is the same as we had as children.

g. The normal microbiota of the gut is similar to that of the skin.

A(n) ___________________ is a genetic variant of the same species.

___________________ are dormant structures that certain bacteria can make. These structures can be seen using the structural stain called the ___________________.

Fill in the blanks: In taxonomy, the broadest groupings are called ___________________, which are further subdivided into six different ___________________. The most specific or narrowest grouping is ___________________, which is the ___________________ name in the binomial nomenclature system.

Classify the following as bright field, dark field, phase contrast, or differential interference contrast (DIC).

a. Sample must be stained or have its own coloration to be seen:

b. Specimen is illuminated with polarized light:

c. Generates a falsely three-dimensional image:

d. The simplest and most common form of light microscopy:

e. Generates a negative image using a hollow cone of light:

f. Generates a negative image in which light shifts are converted into visible changes in brightness and contrast:

How is an opportunistic pathogen different from a pathogen?