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- Question
Which of the following statements is not true?
Options- A. Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
- B. Enzymes function by overcoming the activation energy barrier of a reaction
- C. Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
- D. Enzymes only function when they are in intact cells
- Correct Answer
- Enzymes only function when they are in intact cells
- 1. In aerobic yeast fermentation for production of citric acid from alkanes using a fed-batch culture, why alkanes are slowly fed to the yeast?
Options- A. Citric acid is toxic to the cells
- B. Alkanes cause foaming
- C. Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
- D. Fast addition of alkanes will cause the cells to grow too quickly Discuss
- 2. Power number is ratio of
Options- A. imposed forced to intertial force
- B. bouyant force to inertial force
- C. gravitation force to inertial force
- D. imposed force to gravitational force Discuss
- 3. Yield coefficient represents
Options- A. total biomass or product produced
- B. conversion efficiency of a substrate into product
- C. conversion rate of a substrate into biomass or product
- D. production time of biomass or product Discuss
- 4. The purest form of naturally occurring water is
Options- A. rain water
- B. river water
- C. pond water
- D. well water Discuss
- 5. Which of the following impellers are used for wide range of viscosities?
Options- A. paddles
- B. turbines
- C. propellers
- D. none of these Discuss
- 6. Damkohler number(NDa) is
Options- A. the ratio of the maximum reaction rate to the maximum mass transfer rate
- B. the ratio of the minimum reaction rate to the maximum mass transfer rate
- C. the ratio of the maximum reaction rate to the minimum mass transfer rate
- D. the ratio of the minimum reaction rate to the minimum mass transfer rate Discuss
- 7. If the specific growth rate, ?. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as
Options- A. Cn= Cn0 exp[? (t - t0)]
- B. Cn0 = Cn exp[? (t - t0)]
- C. Cn/Cn0 =(1/?)exp(t-t0)
- D. Cn0 / Cn = (1/?)exp(t-t0) Discuss
- 8. Citrus juice debittering can be carried out using
Options- A. limoninase
- B. inulinase
- C. anthocyanase
- D. None of these Discuss
- 9. Biological oxidation processes usually referred as biological treatment, are the most common form of
Options- A. primary treatment
- B. secondary treatment
- C. tertiary treatment
- D. all of these Discuss
- 10. Which of the following will have the largest interfacial area per unit volume?
Options- A. A bubble with a diameter of 1 mm
- B. A bubble with a diameter of 5 mm
- C. A bubble with a diameter of 15 mm
- D. A bubble with a diameter of 50 mm Discuss
More questions
Correct Answer: Fast addition of alkanes will inhibit the cells and reduce oxygen transfer rates
Correct Answer: imposed forced to intertial force
Correct Answer: conversion efficiency of a substrate into product
Correct Answer: rain water
Correct Answer: turbines
Correct Answer: the ratio of the maximum reaction rate to the maximum mass transfer rate
Correct Answer: Cn= Cn0 exp[? (t - t0)]
Correct Answer: limoninase
Correct Answer: secondary treatment
Correct Answer: A bubble with a diameter of 1 mm
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