This set of Bioprocess Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Anaerobic Bioprocesses”.
1. Ethanol is fermented from which type of source?
a) Fat
b) Lipids
c) Starch
d) Fiber
View Answer
Explanation: Ethanol can be fermented from many sources of starch, including corn, wheat, grain sorghum, barley, and potatoes, and from sugar crops such as sugar cane and sweet sorghum. Because there has been has been an abundant supply of corn, most of the ethanol made in the United States is from corn.
2. Ethanol is an electrolytic solution.
a) True
b) False
View Answer
Explanation: It is important to realize that a compound may dissolve in water (soluble) but not dissociate into ions. Such compounds do not form ions and thus do not produce electrolytic solutions. They are called non-electrolytes. Examples of non-electrolytes include sugar and ethanol.
3. Saccharomyces translation means_________
a) Non-sugar Fungus
b) Non-sugar yeast
c) Sugar fungus
d) Sugar bacteria
View Answer
Explanation: Scientific name: Saccharomyces cerevisiae. Common name: Brewer’s yeast / Baker’s yeast. Habitat: Saccharomyces when translated means “sugar fungus”. That is what this yeast uses for food. They are found in the wild growing on the skins of grapes and other fruits.
4. Fructose is a hexose sugar.
a) True
b) False
View Answer
Explanation: Hexose. Any of various simple sugars, such as glucose and fructose that have six carbon atoms per molecule. Any of various simple sugars (monosaccharides), such as glucose and fructose that have six carbon atoms per molecule.
5. Zymomonas mobilis is __________
a) Facultative aerobe
b) Facultative anaerobe
c) Non- facultative aerobe
d) Non-facultative aerobe
View Answer
Explanation: Zymomonas mobilis is a Gram negative, facultative anaerobic, non-sporulating, polarly-flagellated, rod-shaped bacterium. It is the only species found in the genus Zymomonas. It has notable bioethanol-producing capabilities, which surpass yeast in some aspects.
6. What is Whey?
a) A crop
b) A wheat
c) Liquid of milk curdled
d) Soy protein
View Answer
Explanation: Whey is the liquid remaining after milk has been curdled and strained. It is a byproduct of the manufacture of cheese or casein and has several commercial uses. Sweet whey is a byproduct produced during the manufacture of rennet types of hard cheese, like Cheddar or Swiss cheese. Acid whey (also known as sour whey) is a byproduct produced during the making of acid types of dairy products, such as cottage cheese or strained yogurt.
7. Anaerobic respiration and anaerobic fermentation are same.
a) True
b) False
View Answer
Explanation: Even though fermentation happens without oxygen, it is not the same as anaerobic respiration. Anaerobic respiration begins the same way as aerobic respiration and fermentation. The first step is still glycolysis and it still creates 2 ATP from one carbohydrate molecule.
8. What do you mean by Saccharified?
a) Joining of sugars
b) Joining of fats
c) Breaking of fats
d) Breaking of carbohydrates
View Answer
Explanation: Saccharification : The process of breaking a complex carbohydrate (as starch) into simple sugars.
9. Continuous operation is better than Batch operation in ethanol fermentation.
a) True
b) False
View Answer
Explanation: Continuous operation in ethanol fermentations has significant advantages over batch operation. With continuous media sterilization and aseptic operation techniques, contamination problems associated with continuous operation can be eliminated.
10. What do you mean by Homolactic fermentation?
a) Homogenous environment
b) Heterogenous environment
c) Single acid production
d) Two similar acid production
View Answer
Explanation: Homolactic fermentation- Any form of fermentation that produces a single acid, but especially the anaerobic conversion of pyruvic acid into lactic acid with concomitant oxidation of NADH to NAD.
11. Which of the following condition is correct according to lactic acid fermentation?
a) Both Low temperature and pH
b) Both High temperature and pH
c) Low temperature and high pH
d) High temperature and low pH
View Answer
Explanation: Industrially important homolactics grow at temperatures above 40°C and pH between 5 and 7. High temperature and low pH (pH < 6) reduce the risk of contamination.
12. Ethanol is better than butanol as fuel additive.
a) True
b) False
View Answer
Explanation: Butanol is a better fuel additive than ethanol because of its low vapor pressure, low solubility with water, and complete solubility with diesel fuel.
13. Amylolytic is ___________
a) Conversion of starch into sugar
b) Conversion of sugar into starch
c) Hydrolysis of sugar
d) Breakdown of sugar
View Answer
Explanation: Amylolytic process or amylolysis is the conversion of starch into sugar by the action of acids or enzymes such as amylase.
14. Saccharolysis is _________
a) Conversion of starch into sugar
b) Conversion of sugar into starch
c) Hydrolysis of sugar
d) Breakdown of sugar
View Answer
Explanation: Saccharolytic is capable of hydrolyzing or otherwise metabolizing a sugar molecule resulting in the production of energy.
15. Lignincellulose is a part of woody material.
a) True
b) False
View Answer
Explanation: The woody material that gives plants their rigidity and structure comprises three main types of carbon-based polymer — cellulose, hemicellulose and lignin — collectively called lignocellulosic biomass. When taken apart, these polymers yield chemical components that can be used to make biofuels. It is a complex of lignin and cellulose present in the cell walls of woody plants.
Sanfoundry Global Education & Learning Series – Bioprocess Engineering.
To practice all areas of Bioprocess Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
- Apply for Biotechnology Internship
- Check Biotechnology Books
- Check Bioprocess Engineering Books
- Practice Biotechnology MCQs
