Bioprocess Engineering Mcqs

Q:

Glucose and corn syrup is the same thing in accordance to sweeteners.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: Both products are made from corn starch, but regular corn syrup is 100 percent glucose, while high-fructose corn syrup (HFCS) has had some of its glucose converted to fructose enzymatically.

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Q:

What do you mean by liquefaction?

A) Conversion of liquid to solid B) Conversion of liquid to gas
C) Conversion of solid to liquid D) Conversion of liquid to semi-liquid
 
Answer & Explanation Answer: C) Conversion of solid to liquid

Explanation: Liquefaction is a process that generates a liquid from a solid or a gas or that generates a non-liquid phase which behaves in accordance with fluid dynamics. It occurs both naturally and artificially.

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21
Q:

Which sort of Fermenter is used for production of Penicillin?

A) Batch Fermenter, Fed-Batch Process B) Fed-Batch Fermenter, Fed-Batch Process
C) Continuous Batch Fermenter , Fed-Batch Process D) Fed-Batch Fermenter, Batch process
 
Answer & Explanation Answer: A) Batch Fermenter, Fed-Batch Process

Explanation: For Large production of Penicillin a Batch Fermenter, and a Fed-Batch Process is normally used to prolong the stationary period and so as to increase the production of Penicillin and Batch is used over continuous fermenter for large scale production and fed-batch process is used to overcome its disadvantages.

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20
Q:

Which type of drier is widely used for the production of dry yeast?

A) Spray driers B) Roto–Louvre drier
C) Fluidized bed drier D) Simple drier
 
Answer & Explanation Answer: A) Spray driers

Explanation: Spray driers are the most widely used. A suspension with 10–20% yeast is atomized into a drying chamber and dried with hot air. The drying temperature and time are 50°C and 10–20 min, respectively.

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20
Q:

The crabtree effect is the repression of respiration.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: The Crabtree effect describes the phenomenon whereby the yeast, Saccharomyces cerevisiae, produces ethanol(alcohol) in aerobic conditions and high external glucose concentrations rather than producing biomass via the tricarboxylic acid (TCA) cycle, the usual process occurring aerobically in most yeasts. The crabtree effect works by repressing respiration by the fermentation pathway, dependent on the substrate. The occurrence of alcoholic fermentation is not primarily due to a limited respiratory capacity.

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Q:

Saccharomyces translation means:

A) Non-sugar Fungus B) Non-sugar yeast
C) Sugar fungus D) Sugar bacteria
 
Answer & Explanation Answer: C) Sugar fungus

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.

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34
Q:

What do you mean by submerged fermentation?

A) Fermentation on semi-solid media B) Fermentation on liquid media
C) Fermentation on semi-solid surface D) Fermentation on solid media
 
Answer & Explanation Answer: B) Fermentation on liquid media

Explanation: Submerged fermentation is generally applicable for the manufacturing of cell products by propagation of micro-organisms and cell cultures in a fluid nutrient media.

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38
Q:

What do you mean by surface fermentation?

A) Fermentation on semi-solid media B) Fermentation on liquid media
C) Fermentation on liquid surface D) Fermentation on solid media
 
Answer & Explanation Answer: D) Fermentation on solid media

Explanation: The oldest and a relatively simple method for production of complex flavour extracts is the fermentation of flavour raw materials by bacteria and moulds (aspergillus, mucor) on solid nutrient media. The media is placed in simple thermostatic boxes on baking-tray like plates to which the micro-organisms are inoculated.

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