21. Which of the following Ascomycetes are used for riboflavin production?
A. Eremnothecium ashbyii
B. Ashbya gossypii
C. Candida guilliermondii
D. Both (a) and (b)
22. B. flavum strain can be used for the production of
A. L-Threonine
B. L-Proline
C. L-Isoleucine and L-Histidine
D. All of the above
23. A major organism used in commercial bioleaching for copper recovery is
A. Desulfovibrio desulfuricans
B. Pseudomonas aeruginosa
C. Aspergillus niger
D. Thiobacillus ferrooxidans
24. During fermentation, pyruvic acid is converted into organic products such as
A. glucose and fructose
B. starch and cellulose
C. ethyl alcohol and lactic acid
D. citric acid and isocitric acid
25. Which of the following are true for the heterofermentative microorganism producing lactic acid?
A. Only trace amounts of end products other than lactic acid
B. Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products
C. They are used for commercial lactic acid production
D. None of the above
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