Title: Unit 10 Quiz
Course: ENGY 111 Introduction to Biofuels > Section: ENGY 111 Introduction to Biofuels

Q: Sugars are fermented by enzyme-loaded yeasts which hydrolyzes the sugars, resulting in four hexoses: glucose, mannose, fructose, and galactose.
- True
- False
A: True

Q: Terpenes that are found in a variety of plants are responsible for the odor similar to roses.
- True
- False
A: False

Q: Saccharification is the enzymatic hydrolysis of sugar.
- True
- False
A: False

Q: Steam explosion involves the saturation of the plant material followed by rapid decompression, thus reducing the plant material to separated fibers.
- True
- False
A: True

Q: Anaerobic fermentation is done in the absence of oxygen.
- True
- False
A: True

Q: Ligoncellulose is cellulose fiber that provides a plant's structural strength and is not as readily available for hydrolysis to starch.
- True
- False
A: True

Q: Fermentation produces the highest theoretical yield of 77%.
- True
- False
A: False

Q: In ethanol production, the theoretical yield of the carbohydrate converted to ethanol is 51%.
- True
- False
A: True

Q: Wet milling is a grinding process where corn is cleaned, conditioned for 24 hours to ensure a uniform 15-20 wt-% moisture content, then passed through roller mills, or crushers, to separate the kernel into germ, endosperm, and hulls.
- True
- False
A: False

Q: As a rule-of-thumb, the three products of fermentation are produced in approximately equal weight per bushel.
- True
- False
A: True

Q: Dry milled ethanol yield is approximately 2.5–2.6 gallons per bushel; DDGS 17–18 pounds per bushel; and 16–17 pounds CO_2.
- True
- False
A: True

Q: Which of the following fermentation by-products are NOT produced as commodity chemicals?
- 2,3-Butanediol
- Gasoline
- Aliphatic acid
- Lactic acid
- Succinic acid
A: Gasoline

Q: Corn-to-ethanol plants profitability are based upon DDGS sales.
- True
- False
A: True

Q: Temperature and pH are limiting factors in fermentation.
- True
- False
A: True

Q: Cereal grains are the most widely used sources of starch for fermentation.
- True
- False
A: True

Q: Mechanical grinding of feedstocks releases the starch.
- True
- False
A: True

Q: Physical, chemical, and enzymatic processes fractionate lignocellulose into hemicellulose, cellulose, and lignin.
- True
- False
A: True

Q: Which of the following is NOT a process for converting biorenewable resources to chemicals and fuel?
- Fermentation of sugars and starches
- Fractionation of lignocellulose to simple sugars
- Lipid extraction from oil seeds and terpene-rich plant materials
- Pulverization of coal
- Direct liquefaction of biomass via thermal process
- Indirect liquefaction of biomass-derived syngas
- Fast pyrolysis
A: Pulverization of coal

Q: Aerobic digestion is done without oxygen present.
- True
- False
A: False

Q: In fermentation, sterile conditions are not difficult to sustain on a large scale.
- True
- False
A: False

Q: Biodiesel is the generic name given to modified vegetable oils and animal fats.
- True
- False
A: True

Q: Lipids are biological compounds that are soluble in organic solvents and include terpenes.
- True
- False
A: True