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- Explain the difference between vegetative cells and endospores. What effect will spores have when trying to control microbes via temperature?
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- Give three reasons why endospores are much more resistant to heat than are vegetative cells.Explain what features of endospores make them so resistant to microbial control, and how sterilizing techniques work to destroy them.what microbial features would you use a scanning electron microscope and transmission electron microscope to observe.
- Explain why a jar of jelly can be left open on the kitchen counter for prolonged periods of time, yet no mold or bacteria will grow on it?Describe the formation of endospores and discuss their clinical significance.Why does exposure to UV radiation cause death in vegetative cells but not endospores?
- Compared to a vegetative cell, how much less water is present in an endospore?Look at the following diagrams and predict in which directionosmosis will take place. Use arrows to show the net direction ofosmosis. Is one of these microbes a halophile? Which one?Which has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature? Explain why and how this relates to typicalmethods used to control microbial growth.
- Describe how each of the following physical factors affect microbial growth and aid in classification: a. temperature b. pH c. molecular oxygen d. osmotic pressure.Why are infections that involve biofilms a concern?Describe a microbial biofilm. Discuss why it is likely that a biofilm contains bacteria with different energy metabolisms?