BIOL 305 - Chapter 6 Microbiology Exam 2 Practice Exam

BIOL 305 - Chapter 6 Microbiology Exam 2 Practice Exam Microbiology Exam 2 Practice Exam Chapter 6: 1. Microbial growth is based on? (a) Number of colonies (b) Size of the cells (c) Number of cells/microbes (d) How fast microbes grow 2. 3. What three primary groups are microbes placed in based on their preference of temperature? (a) Psychrophiles- moderate temperature loving microbes Mesophiles- heat-loving temperature microbes Thermophiles- cold-loving temperature microbes (b) Psychrophiles-cold-loving temperature microbes Mesophiles- heat-loving temperature microbes Thermophiles- moderate temperature loving microbes (c) Psychrophiles- cold-loving temperature microbes Mesophiles- moderate loving temperature microbes Thermophiles- heat-loving temperature microbes (d) None of these 4. All of the following are true about psychotrophs EXCEPT… (a) Do not grow well at low temperatures (b) Can cause spoilage on food (c) Refrigerator slows the rate of their spoilage (d) Takes many forms, such as mold mycelium or slime on surfaces, or discoloration or taste. (e) All of the above are true 5. Most bacteria grow best in what conditions? (a) At about 37C (b) In temperatures below 20C (c) In a ph between 6.5 and 7.5 (d) (a) and (c) (e) (b) and (c) 6. Check all that apply for chemical requirements for growth of bacteria. ____ Carbon ____ Sulfur ____ Trace Elements ____ water ____ Nonorganic growth factor ____ oxygen ____ Nitrogen ____ phosphorous ____ potassium ____organic growth factor 7. Check all that apply for physical requirements for bacterial growth. ____ Osmotic Pressure _____ water ____ oxygen _____ pH ____ temperature _____ stable environment ____ a host _____ inorganic compounds 8. Most bacteria grow at an optimum pH of? (a) 6.0 to 7.0 (b) 6.5 to 7.5 (c) 7.5 to 8.5 (d) 7.0 to 8.0 (e) 7.0