Exam 28: Applied and Industrial Microbiology

You are growing Bacillus subtilis,an aerobic bacterium that can also carry out fermentation,when required,in a bioreactor and notice that the growth rate has slowed and the pH has decreased.What could you add?

All of the following are industrial enzymes made by microbial fermentations EXCEPT

Which one of the following is NOT an advantage of the food preservation method known as pascalization?

Which one of the following reactions is performed by yeast in wine-making?

Aseptic packaging of non-metal containers (where the packaging itself is rendered sterile)helps to preserve foods through

Which one of the following is an undesirable contaminant in wine-making due to its production of vinegar rather than ethanol?

Discuss the production of three different non-food/beverage substances that utilize microorganisms in their production.Your discussion should include the specific microorganisms involved and their role in the production of each substance.

Which of the following microbes produces a natural biopesticide?

Figure 28.2 -Figure 28.2 shows the growth curves of Acetobacter under different conditions.Which culture would produce the highest amount of the primary metabolite acetic acid?

Which one of the following pertains to an improperly canned food product on a store shelf that has a bad odor and putrefaction of the canned material?

Bioreactors are widely used for industrial fermentation.Which of the following conditions must be closely monitored for optimal fermentation?

Vessels used for industrial fermentation reactions are known as bioreactors.Explain the difference between batch production and continuous flow production using a bioreactor.

Rhizobium and Bradyrhizobium are mixed with peat moss to increase nitrogen fixation.

All of the following are fuels produced by microorganisms EXCEPT

Figure 28.1 -In Figure 28.1,assume that a secondary metabolite is your desired product.Remember,the top lines/markings indicate the different phases observed in the curve below them.When would you be able to obtain it?

All of the following are true of irradiation methods used for food preservation and sterilization EXCEPT

Canning preserves food

What process does yeast use to produce ethanol for automobile fuel from corn?

A baker forgets to put yeast in his bread dough.Which of the following do you expect to happen to the bread as a result?

Microorganisms play an active role in the formation of industrial products.Which one of the following is mismatched?