To determine the specific growth rate of a bacterial population, it is essential to know
A) cell concentrations at varied time points.
B) total number of cells in the population at varied time points.
C) cell concentrations at varied time points or the generation time.
D) turbidity measurements and the total number of cells in the population at varied time points.
A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles.
A) catalase
B) superoxide dismutase
C) superoxide reductase
D) peroxidase
A halotolerant facultative anaerobic bacterium would grow BEST in a ________ environment.
A) oxygen depleted saline
B) oxygenated saline
C) oxygen depleted non-saline
D) oxygenated non-saline
Which of the following forms of oxygen is/are generally toxic to living organisms?
A) superoxide anion
B) hydrogen peroxide
C) hydroxyl radical
D) superoxide, hydrogen peroxide, and hydroxyl radicals are all toxic
When water activity is low, an organism must
A) increase its internal solute concentration.
B) increase its external solute concentration.
C) decrease its internal solute concentration.
D) decrease its external solute concentration.
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