This set of Fermentation Technology Multiple Choice Questions & Answers (MCQs) focuses on “Media for Industrial Fermentations – Precursors, Regulators and Antifoams”.
1. Which of the following additives are required for a better yield of the desired product?
a) Precursors
b) Regulators
c) Inhibitors
d) Growth Factors
View Answer
Explanation: Precursors are the components added in the medium for better yield of the desired product. It was helpful in improving penicillin yields.
2. Which of the following is used as the precursor for Griseofulvin production?
a) Cyanides
b) Chloride
c) β- Iononones
d) Anthranilic acid
View Answer
Explanation: Chlorides are used as the precursors for the production of Griseofulvin. Griseofulvin is the agent used to treat skin infections. It is taken orally by mouth.
3. Which of the following is used in the preparation of Nikkomycins?
a) Streptomyces organonensis
b) Penicillium chrysogenum
c) Streptomyces tendae
d) Lactobacillus bulgaricus
View Answer
Explanation: Streptomyces tendae is the micro-organism used in the preparation of Nikkomycins. Nikkomycins is the antifungal agent used to treat fungal diseases.
4. Which of the following is used as the precursor of preparation of Cyclosporin C?
a) L – Threonine
b) Cyanides
c) Phenoxy acetic acid
d) D- Threonine
View Answer
Explanation: L – Threonine is used as the precursor for the production of Cyclosporin C. It is used to prevent organ rejection in organ transplant patients.
5. Cyanide is used as a precursor for production of ________
a) Carotenoids
b) Vitamin B12
c) Riboflavin
d) Vitamin B2
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Explanation: Cyanide is used as a precursor for the production of Vitamin B12. Vitamin B12 is also called cobalamin. It is a water-soluble vitamin and is also produced in human intestines.
6. Which of the following is not a property of antifoams?
a) It should be active at low concentrations
b) It should have fast action on an existing foam
c) It should be non-toxic to micro-organism
d) It need not be sterilized
View Answer
Explanation: The antifoam should be active at low concentration, should have fast action on an existing foam and should be non-toxic to the micro-organism and must be sterilized.
7. Who recognized the foaming patterns in fermentation?
a) Lee
b) Hall
c) Tyman
d) Solomons
View Answer
Explanation: Hall et al. in 1973 recognized the patterns of foaming in fermentation. He also said that foaming remains at a constant level throughout the fermentation.
8. Which of the following is not a defoamer?
a) Amide waxes
b) Oleic acid
c) Organic phosphates
d) Propanoic acid
View Answer
Explanation: Amide waxes, Oleic acid, Organic phosphates, Sulphonated oils, Silicone oils, etc. are the antifoaming agents which are added to the medium.
9. The antifoaming agents should not cause any problems in the extraction and purification of the product.
a) True
b) False
View Answer
Explanation: The antifoaming agents should not cause any problems in the extraction and purification of the product. It is an important property of antifoaming agent.
10. The fermentation media should be free from _________
a) Precursors
b) Inhibitors
c) Toxicity
d) Defoamers
View Answer
Explanation: The fermentation media should ideally be free from toxicity or toxic compounds which affect the production of the desired product.
11. The fermentation media should not allow high yield of undesired products.
a) True
b) False
View Answer
Explanation: The fermentation medium should not allow the high yield of undesired products. It should allow the production of desired products and high concentration of the desired product.
12. Which of the following acts as α- Amylase inducer?
a) Yeast mannans
b) Starch
c) Cellulose
d) Pectin
View Answer
Explanation: Starch is used as an inducer for enzyme α- Amylase. It is an amylase that is found majorly in humans and other mammals. It hydrolyzes starch and yields glucose and maltose.
13. In which of the following way, the medium may not influence oxygen availability?
a) Fast metabolism
b) Rheology
c) Antifoams
d) Elicitors
View Answer
Explanation: The medium may influence the oxygen availability in a number of ways like fast metabolism, rheology of medium and antifoams.
14. Maltose is inducer for an enzyme ___________
a) Pectinases
b) Proteases
c) Pullulanase
d) Nitralase
View Answer
Explanation: Maltose is used as an inducer for an enzyme Pullulanase. It degrades pullulan and it has potential industrial applications. It is produced as an extracellular enzyme by gram-negative bacteria.
15. Which of the following is not an inhibitor used in fermentation?
a) Bromide
b) Ethionine
c) Alkali metal
d) Alkali earth metal
View Answer
Explanation: The inhibitors used in fermentation technology are bromide, ethionine, alkali metals, di-ethyl barbiturate, penicillin. Alkali earth metals is not an inhibitor of the fermentation.
Sanfoundry Global Education & Learning Series – Fermentation Technology.
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