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Biotechnology: Why Bioenergy?

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Questions and Answers

What type of microorganisms are involved in the production of biogas through anaerobic digestion?

Facultative anaerobes

Anaerobic organisms (correct)

Obligate aerobes

Aerobic organisms

What is the primary benefit of blending ethanol with gasoline in vehicle fuel?

Extended engine lifespan

Increased fuel efficiency

Reduced carbon monoxide and toxic pollutants (correct)

Improved engine performance

What is the primary advantage of ethanol as a biofuel compared to gasoline?

Lower production cost

Improved engine performance

Higher energy density

Renewable and biodegradable (correct)

What is the typical percentage of ethanol blended with gasoline in a 'gasohol' blend?

10% Signup and view all the answers

What is the primary goal for successful production of ethanol?

Reducing production cost Signup and view all the answers

What is the primary feedstock used for ethanol production through fermentation?

Sugar cane Signup and view all the answers

What is the energy source for Thiobacillus ferrooxidans?

Inorganic sources Signup and view all the answers

What is the pH level preferred by Thiobacillus ferrooxidans?

Acidic Signup and view all the answers

What is the result of Thiobacillus ferrooxidans oxidizing ferrous to ferric?

Leaching of metals from ores Signup and view all the answers

What is a unique ability of Thiobacillus ferrooxidans?

Oxidizing ferrous to ferric Signup and view all the answers

Why is Thiobacillus ferrooxidans attractive for commercial leaching operations?

It can leach metals from low-grade ores Signup and view all the answers

What is a characteristic of Thermoanaerobacter ethanolicus that makes it a suitable microorganism for bioethanol production?

Production of considerable amounts of ethanol from soluble sugars and polymeric substrates Signup and view all the answers

What is a limitation of Zymomonas mobilis in producing bioethanol?

Restricted utilizable substrate range to glucose, fructose, and sucrose Signup and view all the answers

What is the primary product of anaerobic digestion of organic material?

Methane biogas Signup and view all the answers

What is the first stage of anaerobic digestion?

Bacterial hydrolysis of input materials Signup and view all the answers

What is an advantage of Zymomonas mobilis over Saccharomyces cerevisiae in producing bioethanol?

Higher sugar uptake and ethanol yield Signup and view all the answers

What is the primary purpose of using microorganisms like Thermoanaerobacter ethanolicus and Zymomonas mobilis in bioethanol production?

To reduce the recovery costs of ethanol Signup and view all the answers