EVCC MICRO EXAM 2 QUESTIONS & ANSWERS 100% GUARANTEED PASS 2025 A+ How do you define microbial growth? - ANS-an increase in population size What is a colony and where does it come from? - ANS-visible mass of microorganisms all originating from a single mother cell What conditions affect microbial growth? - ANS-Temperature, pH, Water/osmotic pressure, Oxygen/detox, nutrients What are the categories of organisms based on temperature? - ANS-Psychrophile -5 to 15 C. Polar regions Psychrotroph 20 to 30 C. Food spoilage Mesophile 25 to 45 C. Pathogens 35 to 40 C Thermophile 45 to 70 C. Hot springs Hyperthermophile 70 to 110 C. Archaea-hydrothermal vents What are the categories of organisms based on oxygen requirements? - ANS-Obligate aerobe - only grow in O2 Facultative anaerobe - grows in both but prefers O2 Obligate anaerobe - can only grow without O2 Aerotolerant - grows in both equally Microaerophile - prefers medium/low O2 What are the categories of organisms based on acid/base tolerance? - ANS-
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