Self Evaluation

Q1. Propionic acid is produced by:
A    P. acidipropionicii
B    C. acetobutylicum
C    C. butyricum
D    E. coli

Q2. The propionic acid is produced by:
A    Consumption of substrate and conversion of pyruvic acid in the culture metabolism
B    Consumption of substrate only in the culture metabolism
C    Consumption of pyruvic acid only in the culture metabolism
D    Consumption of succinic acid only in the culture metabolism

Q3. The specific substrate consumption rate of microorganism producing propionic acid is:
A    Dependent on availability of limiting nutrient and inhibited by availability of acetic
            and propionic acid.
B    Dependent on availability of limiting nutrient and inhibited by availability of
            propionic acid.
C    Dependent on availability of limiting nutrient and inhibited by availability of acetic
            acid.
D    Dependent on availability of limiting nutrient only and not inhibited by availability of
            acetic and propionic acid.

Q4. The structure of the model features:
A    Death of cells when substrate concentration in broth is zero
B    Positive substrate consumption for maintenance of cells even when no substrate is
            available in broth
C    Both a & b
D    Death of cells at very high substrate concentration

Q5. Succinic acid is produced:
A    By direct consumption of substrate and through the consumption of pyruvic acid
B    By direct consumption of substrate
C    By direct consumption of pyruvic acid
D    By direct consumption of acetic acid

Q6. Anaerobic condition in the bioreactor is maintained by:
A    Purging of N2 in the fermentation broth
B    Purging of H2 in the fermentation broth
C    Purging of N2 and addition of dyes (resazurin) in the fermentation broth
D    Purging of O2 in the fermentation broth

Q7. Out of the Four acids produced in the propionic acid fermentation:
A    Propionic acid and Acetic acid are more inhibitory for growth
B    Propionic Acetic and Succinic acid are more inhibitory for growth
C    Succinic and Pyruvic acid are more inhibitory for growth
D    Propionic and succinic acid are more inhibitory for growth

Q8. For product inhibited fermentation like propionic acid:
A    Batch fermentations features low accumulation of products and high productivity
B    Fed-batch fermentations features low accumulation of products and high productivity
C    Continuous fermentation features low accumulation of products and high productivity
D    Either a or b

Q9. For Continuous cultivation productivity can be increased by:
A    Cell recycle
B    Cell retention
C    Both a and b
D    None of the above

Q10. The plug flow reactor features:
A    Continuous product removal
B    Inadequate mixing
C    Both a and b
D    Better performance than CSTF