Fermentation Quiz
C. Kohn, Waterford WI
Name:
Hour
Date:
Score
/15
1. How does fermentation differ from respiration?
a. Fermentation does not require oxygen to occur
b. Respiration does not produce ethanol
c. Fermentation does not produce CO2
d. All of the above
e. Only A and B
2. What is the most widely used organism for fermentation?
a. Saccharomyces cerevisiae b. Clostridium acetobutylicum c. Enterobacter cloacae
3. Yeast can convert carbohydrates into ethanol because they produce _____ that can break down carbohydrates
into simple glucose molecules and can convert glucose into ethanol
a. Acids b. Enzymes c. Bases d. Fats
4. Define saccharification in corn ethanol production:
a. Chopping long starch molecules into individual glucose molecules
b. Soaking the corn kernels before processing them
c. Converting the sugars in a corn kernel into ethanol
d. Separating the cellulose in corn from lignin and hemicellulose
5. What is the primary difference between wet-milling and dry-milling of corn grain ethanol?
a. Saccharification b. Steeping c. Fermentation d. Pretreatment
6. Why would an ethanol producer choose dry-milling over wet-milling?
a. It is cheaper
b. It is more flexible
c. Its ethanol has a higher MPG
d. Its ethanol has a higher octane rating
7. Cellulose is a polymer of glucose; what is a polymer?
a. The same substance in a different chemical state (e.g. solid vs. liquid form)
b. A partially digested form of a natural substance
c. A type of natural “glue” that holds a molecule together
d. A long chain of repeating molecules
8. Cellulose can be consumed by ruminant cattle because they are able to _______ before digesting it
a. Grind it b. Hydrolyze it c. Ferment it d. All of the above
Copyright 2011 by Craig Kohn, Agricultural Sciences, Waterford WI. This source may be freely used and distributed provided the author is cited.
9. Why is cellulosic ethanol so much more difficult to produce than ethanol from corn or sugar-cane?
a. Cellulose is wrapped in lignin, which protects it
b. Cellulose is wrapped in hemicelluloses, which protects it
c. Cellulose has bonds that have different orientations, whereas the orientation of the bonds of starch are
all the same
d. Cellulose requires more and different enzymes than starch in order to be completely broken down
e. All of the above
10. The “unwrapping and unpacking” step of ethanol production from cellulose is known as…
a. Biomass Production
b. Pretreatment & Hydrolysis
c. Sugar Fermentation
d. Biofuel Processing
11. What is the most expensive step of ethanol production from cellulosic sources?
a. Biomass Production
b. Pretreatment & Hydrolysis
c. Sugar Fermentation
d. Biofuel Processing
12. Which feedstock use would reduce greenhouse gas emissions the most (through its overall LCA)?
a. Sugar cane b. Corn c. Cellulosic d. All of the above would be the same
13. Which feedstock would provide the largest available fuel source?
a. Sugar cane b. Corn c. Cellulosic d. All of the above would be the same
14. Which step is the biggest obstacle facing cellulosic ethanol?
a. Biomass Production
b. Pretreatment & Hydrolysis
c. Sugar Fermentation
d. Biofuel Processing
15. A cow is able to use cellulose as a source of food because it has cellulase-producing microbes in its ______
a. Abomasum b. Omasum c. Reticulum d. Rumen
Copyright 2011 by Craig Kohn, Agricultural Sciences, Waterford WI. This source may be freely used and distributed provided the author is cited.