Latest | BIOS 242 Exam 2 Study Guide Fundamentals of Microbiology with Lab - Chamberlain What are the stages of the normal growth curve in a bacterial culture? • Lag phase • Exponential Growth Phase • Stationary Phase • Death Phase What is lag phase? • Flat period when the population appears not to be growing; cells are not yet multiplying at their maximum rate. What is exponential growth phase? • Period during which the growth curve increases geometrically What is stationary growth phase? • Population enters survival mode; cells stop growing or grow slowly What is death phase? • Cells begin to die an exponential rate What does optimal (optimum) growth temperature mean? • Range of temperature that promotes the fastest rate of growth and metabolism Photoautotroph • Captures energy from sunlight Chemoautotroph • Energy source is simple inorganic chemicals Photoheterotroph • Energy source is sunlight Chemoheterotroph • Energy source is chemicals What is the temperature of adaptation for psychrophiles? • Below 15 degrees celsius What is the temperature of adaptation for psychrotrophs? • 15-30 degrees celsius What is the temperature of adaptation for mesophiles? • 30-40 degrees celsius
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