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Problem SA7
Draw and label the four distinct phases of a bacterial growth curve. Describe what is happening within the culture as it passes through the phases.
Problem V2
Describe the type of hemolysis shown by the pathogen Staphylococcus aureus pictured here.
Problem MC4
The most reactive of the four toxic forms of oxygen is ________.
a. The hydroxyl radical
b. The peroxide anion
c. The superoxide radical
d. Singlet oxygen
Problem FIB2
A toxic form of oxygen,___________ oxygen, is molecular oxygen with electrons that have been boosted to a higher energy state.
Problem SA4
Why must media, vessels, and instruments be sterilized before they are used for microbiological procedures?
Problem SA13
How does a chemostat maintain a constant population size?
Problem FIB8
___________ pigments protect many phototrophic organisms from photochemically produced singlet oxygen.
Problem FIB11
Chemolithotrophs acquire electrons from (organic/inorganic)___________ compounds.
Problem 11.10a
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.
__________ When environmental nutrients are depleted, myxobacteria aggregate in mounds to form fruiting bodies..
Problem 11.2a
What are extremophiles? Describe two kinds, and give examples.
Problem 11.5a
How is Halobacterium salinarum distinctive?
a. It is absolutely dependent on high salt concentrations to maintain its cell wall.
b. It is found in terrestrial volcanic habitats.
c. It photosynthesizes without chlorophyll.
d. It can survive 5 million rad of radiation.
Problem 11.6a
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.
Problem 11.7a
Which genus is the most common anaerobic human pathogen?
a. Bacteroides
b. Spirochetes
c. Chlamydia
d. Methanopyrus
Problem 27.3a
In the environment, nutrients are generally _____.
a. limiting
b. present in excess
c. stable
d. artificially induced
Problem 27.3a
_____ Aquatic microorganisms are more prevalent near the surface than at the bottom of waterways.
Problem 27.4a
_____ Abyssal organisms are found near shores of oceans.
Problem 27.7a
In aquatic environments, most microbial life is found in the _____.
a. littoral zone
b. limnetic zone
c. profundal zone
d. benthic zone
