Which of the following is false concerning microbial contaminants?
a. Contaminants may become opportunistic pathogens.
b. Most microbial contaminants will eventually cause harm.
c. Contaminants may be a part of the transient microbiota.
d. Contaminants may be introduced by a mosquito bite.

Acetobacter is necessary for only one of the steps of vitamin C manufacture. The easiest way to accomplish this step would be to

a. add substrate and Acetobacter to a test tube.

b. affix Acetobacter to a surface and run substrate over it.

c. add substrate and Acetobacter to a bioreactor.

d. find an alternative to this step.

e. none of the above

Barophiles _______.

a. cannot cause diseases in humans

b. live at normal barometric pressure

c. die if put under high pressure

d. thrive in warm air

For each of the following statements that is true, write “true” in the blank. For each statement that is false, write the word(s) that should be substituted for the underlined word(s) to make the statement correct.

__________ Halophiles inhabit extremely saline habitats, such as the Great Salt Lake.

What are extremophiles? Describe two kinds, and give examples.

In the environment, nutrients are generally _____.

a. limiting

b. present in excess

c. stable

d. artificially induced

_____ Aquatic microorganisms are more prevalent near the surface than at the bottom of waterways.

_____ Abyssal organisms are found near shores of oceans.

Methanopyrus kandleri is a species of archaea that lives in the hydrothermal vents of the Pacific Ocean. This species' optimal temperatures are between 100-122 ºC. This species also does not require oxygen, as it survives off of hydrogen gas and releases methane gas. What environmental classifications would this archaeal species fit into?