MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Biotechnology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The has a merit over yeast because |
| A. | it has more osmotic tolerance to higher sugar concentration |
| B. | it has high tolerance to ethanol |
| C. | it has more specific growth rate |
| D. | all of the above |
| Answer» E. | |
| 2. |
is used for the fermentation of waste sulphate liquor since it ferments |
| A. | hexoses only |
| B. | pentoses only |
| C. | both hexoses and pentoses |
| D. | none of these |
| Answer» D. none of these | |
| 3. |
start producing ethanol with in |
| A. | 10 h |
| B. | 12 h |
| C. | 15 h |
| D. | 24 h |
| Answer» C. 15 h | |
| 4. |
If starch containing substrates are used for ethanol production, yeast strain can't be used directly because |
| A. | it doesn't contain amylases to hydrolyze starch |
| B. | starch is not a suitable substrate for the production of ethanol |
| C. | it is converted to pentose sugar |
| D. | none of the above |
| Answer» B. starch is not a suitable substrate for the production of ethanol | |
| 5. |
Which of the following is used to check vortex and to improve aeration efficiency in a fermentor? |
| A. | Impeller |
| B. | Baffles |
| C. | Sparger |
| D. | All of these |
| Answer» C. Sparger | |
| 6. |
What are the fermentation conditions for the ethanol production? |
| A. | pH 6; temperature 35 C |
| B. | pH 5; temperature 35 C |
| C. | pH 6; temperature 30 C |
| D. | pH 5; temperature 30 C |
| Answer» C. pH 6; temperature 30 C | |
| 7. |
Which of the following is used for agitation in a fermentor? |
| A. | Impeller |
| B. | Baffles |
| C. | Sparger |
| D. | All of these |
| Answer» B. Baffles | |
| 8. |
To maintain aseptic conditions during fermentation which of the following is needed? |
| A. | Sterilization of fermentor |
| B. | Sterilization of air supply |
| C. | Aeration and agitation |
| D. | All of these |
| Answer» E. | |
| 9. |
High ethanol concentration |
| A. | promotes yeast growth |
| B. | inhibits yeast growth |
| C. | promotes bacterial growth |
| D. | inhibits bacterial growth |
| Answer» C. promotes bacterial growth | |
| 10. |
As the fermentation for the ethanol production is over, the cells are separated to get the biomass of yeast cells that is used |
| A. | for next fermentation |
| B. | as single cell protein for animal feed |
| C. | as manure |
| D. | all of the above |
| Answer» C. as manure | |
| 11. |
The fermentor can be sterilized by |
| A. | keeping it in the oven |
| B. | steam under pressure |
| C. | boiling |
| D. | all of these |
| Answer» C. boiling | |
| 12. |
Candida utilis is used for the fermentation of waste sulphate liquor since it ferments |
| A. | hexoses only |
| B. | pentoses only |
| C. | both hexoses and pentoses |
| D. | none of these |
| Answer» D. none of these | |
| 13. |
Yeast is used in the production of |
| A. | ethyl alcohol |
| B. | acetic acid |
| C. | cheese |
| D. | curd |
| Answer» B. acetic acid | |
| 14. |
Which of the following organism is not used in any of the traditional industrial fermentation? |
| A. | <i>E. coli</i> |
| B. | <i>Yeast</i> |
| C. | <i>Bacillus</i> |
| D. | <i>Pseudomonas</i> |
| Answer» B. <i>Yeast</i> | |
| 15. |
How is air supply to the fermentor sterilized? |
| A. | By heat filtration |
| B. | Filtration through fibrous material |
| C. | Filtration through granular material |
| D. | All of the above |
| Answer» E. | |
| 16. |
S cerevisiae start producing ethanol with in |
| A. | 10 h |
| B. | 12 h |
| C. | 15 h |
| D. | 24 h |
| Answer» C. 15 h | |
| 17. |
Which of the following microorganisms help in the ethanol production? |
| A. | <i>Saccharomyces cerevisiae</i> |
| B. | <i>Zygomonas mobilis</i> |
| C. | <i>Saccharomyces uvarum</i> |
| D. | All of these |
| Answer» E. | |
| 18. |
After the fermentation is over, ethanol is recovered by |
| A. | centrifugation |
| B. | distillation |
| C. | filtration |
| D. | cell disintegration |
| Answer» C. filtration | |
| 19. |
The Zygomonas has a merit over yeast because |
| A. | it has more osmotic tolerance to higher sugar concentration |
| B. | it has high tolerance to ethanol |
| C. | it has more specific growth rate |
| D. | all of the above |
| Answer» E. | |
| 20. |
What are different substrates used for ethanol production? |
| A. | Starch containing substrate |
| B. | Juices from sugarcane or molasses or sugar beet |
| C. | Waste product from wood or processed wood |
| D. | All of the above |
| Answer» E. | |
| 21. |
Which of the following is used for aeration in a fermentor? |
| A. | Impeller |
| B. | Baffles |
| C. | Sparger |
| D. | All of these |
| Answer» D. All of these | |
| 22. |
Ethanol is produced by |
| A. | continuous fermentation |
| B. | batch fermentation |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |