EXAM 2

Die without oxygen – Obligate anaerobes

Die in the presence of oxygen – Obligate anaerobes

Grow best in reduced levels of oxygen – Microaerophiles

Cannot use oxygen but are not killed by it – Aerotolerant anaerobes

Can use oxygen if available but do not need it – Facultative anaerobes

Chemoautotroph – Get energy from nutrient breakdown, get carbon from carbon dioxide

Chemoheterotroph – Get energy from nutrient breakdown, get carbon from organic compounds

Photoautotroph – Get energy from sunlight, get carbon from carbon dioxide

Photoheterotroph – Get energy from sunlight, get carbon from organic compounds

Thrive in high salt environments – Halophiles

Thrive in environments with high temperatures – Thermophiles

Thrive in environments with high pressure – Barophiles

Thrive in environments with cold temperatures – Psychrophiles

Thrive in environments with low pH – Acidophiles

Chemostats are used to grow continuous cultures of microbes. – A (True)

Dental plaque is an example of a biofilm. – A (True)

Clostridium difficile is an example of an endospore-forming bacterium. – A (True)

Superoxide dismutase converts hydrogen peroxide to oxygen and water. – B (False)

Most bacteria that are pathogenic to humans are chemoheterotrophs. – A (True)

Binary fission involves dividing a single cell into two cells. – A (True)

Before a bacterium divides, its chromosome is replicated. – A (True)

Autotrophs use carbon fixation to convert inorganic carbon into organic carbon. – A (True)

Organisms that need to be provided with multiple growth factors are said to be fastidious. – A (True)