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- Explain why microorganisms differ in their pH requirements.Explain the mechanism of action of several of the physical and chemical agents employed to control microbial growth.Explain the purpose and phase where cells lose flagella and motility in biofilm formation, and why the amount of cell density is an important factor in type of bacteria where biofilm formation is triggered.
- Explain 2 factors that influence microbial growth.The principles of osmosis are used in food preservation. Certain foods are stored in strong salt solutions (brine) or in syrups to prevent infection by microbes. a) Explain how the principles of osmosis apply to this situation. b) What effect will these solutions have on the micro-organisms?Describe the range of temperatures a microbe can function within.
- Identify external sources of energy that are used by microbes, as well as energy carriers and other immediately available sources of energy that that microbial cells use for growth processes.Describe several physical and chemical requirements for microbial growth, and explain what factors determine optimal conditions.A microbe cannot grow without using enzymes. Explain why bacteria are limited to growth within a given temperature range. Explain why bacteria are limited in growth within a specific pH range.
- Define microbial growth. Outline the effects of temperature, pH, osmotic pressure and oxygen onmicrobial growth.explain the factors that influence the growth of microorganisms.E. coli, a facultative anaerobe, is grown for 24 hours on the same type of solid medium, but under two different conditions: one aerobic, the other anaerobic. The size of the colonies would bea) the same under both conditions.b) larger when grown under aerobic conditions.c) larger when grown under anaerobic conditions.