Q: Which equation represents the conversion of glucose to lactic acid during homolactic fermentation?

$$\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{CH}_3\text{CH}(OH)\text{COOH}$$

Q: In bioremediation, reductive dehalogenation is used to remove chlorinated compounds. Which equation best represents the dehalorespiration of tetrachloroethene (PCE) to trichloroethene (TCE)?

$$\text{C}_2\text{Cl}_4 + 2\text{H}^+ + 2\text{e}^- \rightarrow \text{C}_2\text{HCl}_3 + \text{Cl}^-$$

Question 1

Which of the following best explains why biopesticides, such as Bacillus thuringiensis (Bt), are preferred over chemical pesticides in agriculture?

Accepted Answer

Biopesticides are specific to target pests and reduce environmental impact.

Question 2

The parasporal crystal produced by Bacillus thuringiensis (Bt) is activated in the insect gut by which process?

Accepted Answer

Alkaline gut conditions and protease digestion

Question 3

Which step in the nitrogen fixation process by symbiotic rhizobia is directly triggered by plant-produced flavonoids?

Accepted Answer

Activation of bacterial nod genes

Question 4

George Washington Carver promoted the use of legumes in crop rotation primarily because:

Accepted Answer

Legumes increase soil fertility through symbiotic nitrogen fixation.

Question 5

During cheese production, which microbial process is responsible for the formation of holes ("eyes") in Swiss cheese?

Accepted Answer

Propionic acid fermentation

Question 6

In the fermentation of cocoa beans, which sequence of microbial populations is typically observed?

Accepted Answer

Yeasts → lactic acid bacteria → acetic acid bacteria → spore-forming bacteria

Question 7

Which equation represents the conversion of glucose to lactic acid during homolactic fermentation?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 ightarrow 2	ext{CH}_3	ext{CH}(OH)	ext{COOH}$$

Question 8

Which of the following is a primary reason for treating wastewater before releasing it into natural waterways?

Accepted Answer

To remove toxic pollutants and prevent environmental contamination

Question 9

In bioremediation, reductive dehalogenation is used to remove chlorinated compounds. Which equation best represents the dehalorespiration of tetrachloroethene (PCE) to trichloroethene (TCE)?

Accepted Answer

$$	ext{C}_2	ext{Cl}_4 + 2	ext{H}^+ + 2	ext{e}^- ightarrow 	ext{C}_2	ext{HCl}_3 + 	ext{Cl}^-$$

Question 10

Which genetically engineered microorganism is used for decontaminating nuclear pollutants due to its radio-resistance?

Accepted Answer

Deinococcus radiodurans

Question 11

Mercury bioremediation in aquatic environments often involves the conversion of $$Hg^{2+} to $$less toxic forms. Which microbial process is most effective for this conversion?

Accepted Answer

Reduction to $$Hg^0$$

Question 12

Which of the following best describes the role of microbes in the secondary treatment of wastewater?

Accepted Answer

Microbes degrade organic matter through metabolic activity.

Question 13

Which fermentation pathway is responsible for the production of ethanol and carbon dioxide in bread making?

Accepted Answer

Ethanolic fermentation

Question 14

In the context of bioremediation, what is the primary advantage of using bioaugmentation?

Accepted Answer

It introduces specialized microbes to accelerate pollutant degradation.

Question 15

Which of the following is a real-world example of applied environmental microbiology?

Accepted Answer

Using bacteria to treat wastewater in sewage plants

Question 16

Which equation represents the conversion of pyruvic acid to ethanol and carbon dioxide during ethanolic fermentation?

Accepted Answer

$$2	ext{CH}_3	ext{COCOOH} ightarrow 2	ext{C}_2	ext{H}_5	ext{OH} + 2	ext{CO}_2$$

Question 17

Which microbial process is most important for increasing crop yield in soybeans grown with symbiotic rhizobia?

Accepted Answer

Nitrogen fixation

Question 18

Which of the following is a key step in the microbial degradation of toxic chlorinated compounds at Superfund sites?

Accepted Answer

Reductive dehalogenation by specialized bacteria

Question 19

Which of the following best describes the role of microbes in the production of chocolate?

Accepted Answer

Microbes ferment cocoa beans, developing flavor and reducing bitterness.

Applied Microbiology: Harnessing Microbes for Agriculture, Food, and Environmental Solutions

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