Curacin - A is a potent anti-tumour agent obtained from a marine
A. Actinomycetes
B. Cyanobacterium
C. Aspergillus
D. Coral reef
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A microbial product can be extracted from fermentation broth by
A. Chromatography
B. Chemical derivatisation
C. Fractional precipitation
D. All the above
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Biodiesel is produced from fats/oil through a process known as
A. Esterification
B. Hydrolysis
C. Transesterification
D. Condensation
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Saccharomyces cerevisiae is called "top yeast" because it
A. Produces "top" quality
B. Rises to wines of the surface (top) during the fermentation process
C. Requires "top quality" of substrates during the fermentation process
D. Is commonest yeast-producing alcohol
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The malolactic fermentation is encouraged by species of
A. Lactobacillus
B. Pediococcus
C. Saccharomyces
D. Leuconostoc
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Fill in the blanks with appropriate option: vinegar is a liquid consisting of acetic acid produced by the fermentation of . . . . . . . . by . . . . . . . .
A. Glucose, S. cerevisiae
B. Ethanol, A. aceti
C. Lactose, L. acidophilus
D. Starch, B. amyloliquefaciens
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Product of fermentation of glucose by yeast is
A. (C6 H10 O5 )n
B. C2 H5 OH
C. C6 H12 O6
D. CH3 OH
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Commercial production of rum is based on
A. Molasses
B. Corn steep liquor
C. Wheat and barley grains
D. Sulfite waste liquor
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Yeast is used for the preparation of
A. Acetic acid
B. Curd
C. Ethyl alcohol
D. Cheese
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Which one of the following materials is a bioplastic?
A. Polypropylene
B. Alginate
C. Polyhydroxybutyrate
D. Dextran
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Combination of high temperature during processing, low temperature during storage and increasing the acidity for prevention of food contamination is known as
A. Stumbling technology
B. Mixed preservation approach
C. High pressure food preservation
D. Hurdle technology
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If the pulse input response curve for a CSTR shows a long tail, it means
A. Strong internal circulation in the reactor
B. Dead space in the reactor
C. Short circulating in the reactor
D. Parallel flow in the reactor
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Bottom yeasts ferment the sugars at
A. 6° - 12°C
B. 12° - 15°C
C. 5° - 8°C
D. 4° - 9°C
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The application of the principles of process technology to biological systems is called
A. Bioleaching
B. Bioprocess technology
C. Bioreactors or fermentors
D. Food processing
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Beer is a product of
A. Fermentation of barley grains by yeasts
B. Fermentation of fruits
C. Fermentation brought about by molds
D. Fermentation of hops
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Production of citric acid is inhibited by
A. Sodium azide
B. Thioglycolate
C. Sodium cyanide
D. None of the above
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The media for large scale industrial fermentation process usually
A. Use highly purified carbon sources
B. Consist of waste products from other processes, such as grain milling
C. Do not require a nitrogen source because the atmosphere provides nitrogen
D. All the above
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In a batch reactor, which one of the following is true regarding specific growth rate?
A. It remains constant with time
B. It continuously increases with time
C. It continuously decreases with time
D. It reache s a maximum in the exponential phase
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The toxicity of weak organic acids to microbial cells
A. Enhances as the pH falls
B. Decreases as the pH falls
C. Is not affected by pH
D. Is highest at pH 7.0
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In a chemostat, which one of the following would increase the exit cell concentration
A. Increase in inlet substrate concentration
B. Increase in dilution rate
C. Increase in inoculum size
D. Increase in impeller size
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