A bacterial isolate is subcultured to two blood agar plates, one of which is incubated in an anaerobe jar, and the other is incubated on a shelf in the incubator. After incubation, growth is observed on the plate from the anaerobe jar, but there is no growth on the plate incubated on the incubator shelf. Based on these results, how would this organism be categorized?

obligate aerobe
obligate anaerobe
aerotolerant anaerobe
facultative anaerobe


obligate anaerobe

Biology & Microbiology

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A relationship that affects the populations of two or more species adversely is referred to as ________ competition

Fill in the blank(s) with correct word

Biology & Microbiology

When an enzyme catalyzes a reaction

A) it lowers the activation energy of the reaction. B) it raises the activation energy of the reaction. C) it acts as a reactant. D) it is used once and discarded.

Biology & Microbiology

The tuberculin response is mediated by

A) memory T cells. B) mast cells. C) B lymphocytes. D) plasma cells. E) eosinophils.

Biology & Microbiology

Which form of direct measurement uses statistical estimation to estimate the number of microbes in a sample?

A. Viable plate count B. Microscopic count C. Most probable number (MPN) D. Serial dilution

Biology & Microbiology