Q. In fermentation kinetics, what does the term 'lag phase' refer to?
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A.
Rapid growth phase
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B.
Adaptation period
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C.
Stationary phase
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D.
Decline phase
Solution
The lag phase is the adaptation period where microorganisms adjust to their environment before active growth begins.
Correct Answer:
B
— Adaptation period
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Q. What is the effect of increasing substrate concentration on fermentation rate?
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A.
Increases indefinitely
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B.
Decreases
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C.
Increases to a point then levels off
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D.
Has no effect
Solution
Increasing substrate concentration typically increases fermentation rate to a saturation point, after which it levels off.
Correct Answer:
C
— Increases to a point then levels off
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Q. What is the main product of lactic acid fermentation?
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A.
Ethanol
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B.
Carbon dioxide
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C.
Lactic acid
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D.
Acetic acid
Solution
Lactic acid is the main product of lactic acid fermentation, which occurs in certain bacteria and muscle cells.
Correct Answer:
C
— Lactic acid
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Q. What is the primary substrate used in fermentation processes?
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A.
Glucose
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B.
Lactate
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C.
Ethanol
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D.
Acetate
Solution
Glucose is the primary substrate for fermentation, as it is readily metabolized by many microorganisms.
Correct Answer:
A
— Glucose
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Q. What is the role of enzymes in fermentation?
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A.
Increase temperature
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B.
Catalyze reactions
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C.
Consume substrates
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D.
Produce waste products
Solution
Enzymes catalyze biochemical reactions during fermentation, facilitating the conversion of substrates into products.
Correct Answer:
B
— Catalyze reactions
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Q. What is the significance of the 'maximum specific growth rate' in fermentation?
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A.
Indicates the fastest growth rate
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B.
Determines substrate concentration
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C.
Measures product yield
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D.
Indicates fermentation duration
Solution
The maximum specific growth rate indicates the fastest growth rate of microorganisms during fermentation under optimal conditions.
Correct Answer:
A
— Indicates the fastest growth rate
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Q. Which factor does NOT significantly affect fermentation rate?
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A.
Temperature
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B.
pH
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C.
Oxygen concentration
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D.
Color of the substrate
Solution
The color of the substrate does not significantly affect fermentation rate, while temperature, pH, and oxygen concentration do.
Correct Answer:
D
— Color of the substrate
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Q. Which microorganism is commonly used in alcoholic fermentation?
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A.
Escherichia coli
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B.
Saccharomyces cerevisiae
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C.
Lactobacillus
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D.
Bacillus subtilis
Solution
Saccharomyces cerevisiae, or baker's yeast, is widely used in alcoholic fermentation to produce ethanol.
Correct Answer:
B
— Saccharomyces cerevisiae
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Q. Which of the following is a byproduct of alcoholic fermentation?
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A.
Lactic acid
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B.
Ethanol
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C.
Acetic acid
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D.
Carbon dioxide
Solution
Carbon dioxide is a byproduct of alcoholic fermentation, along with ethanol.
Correct Answer:
D
— Carbon dioxide
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Q. Which type of fermentation occurs in muscle cells during intense exercise?
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A.
Alcoholic fermentation
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B.
Lactic acid fermentation
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C.
Acetic acid fermentation
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D.
Butyric acid fermentation
Solution
Lactic acid fermentation occurs in muscle cells during intense exercise when oxygen levels are low.
Correct Answer:
B
— Lactic acid fermentation
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