MCQ Bank
Which of the following is a methylotrophic yeast?
- A) Candida albicans
- B) Kluyveromyces marxianus
- C) Pichia pastoris
- D) Saccharomyces cerevisiae
The most common cause of foaming is due to proteins in the medium, such as corn-steep liquor, meal, ____________ , yeast extract or meat extract.
- A) hydrogen
- B) soybean meal
- C) carbon
- D) nitrogen
The pH of the culture medium is 5.5. What will be needed to add to culture medium to adjust the pH to 7.0?
- A) 0.1 N HCl
- B) 0.1 N H3PO4
- C) 0.1 N HNO3
- D) 0.1 N NaOH
Which of the following is an inducer for pullulanase?
- A) Glucose
- B) Starch
- C) Maltose
- D) Isovaleronitrile
Which one of the following is a biological problem associated with foaming of fermentation medium?
- A) Lower mass and heat transfer rates
- B) Increased chances of microbial infection
- C) Incorrect monitoring and control
- D) Reduction in the working volume of the fermenter
1- Soy meal is often used in __________ production.
- A) Yeast
- B) antibiotic
- C) starch
- D) ethanol
What is the effect of sodium bisulfate addition during the production of glycerol by Saccharomyces cerevisiae?
- A) Repression of rifamycin production
- B) Repression of acetaldehyde production
- C) Repression of chlortetracycline production
- D) Repression of oxalic acid production
The majority of fermentation processes are aerobic and, therefore, require the provision of ________________
- A) carbon
- B) sulpher
- C) hydrogen
- D) oxygen
What is the critical dissolved oxygen concentration for Escherichia coli at 37oC?
- A) 0.018 mmoles dm-3
- B) 0.001 mmoles dm-3
- C) 0.008 mmoles dm-3
- D) 0.022 mmoles dm-3
Temperature, concentration of oxygen in the bulk liquid, saturation concentration of oxygen in the liquid, concentration of oxygen in the bubble, size of the molecule and viscosity of the medium are the factors which effect the rate of diffusion of
- A) carbon
- B) hydrogen
- C) nitrogen
- D) oxygen
"DO" stands for _________
- A) dissolved oxygen
- B) deficient oxygen
- C) dissolved oxalate
- D) defunct oxygen
What is the solubility of oxygen in pure water at 4oC?
- A) 0.1 mg/L
- B) 18 mg/L
- C) 8 mg/L
- D) 10 mg/L