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MCQs

Total Questions : 116 | Page 8 of 12 pages
Question 71. . 
The biotin level in obtaining L-gluatmic acid by fermentation using Micrococcus glutamicus is critical because
  1.    too low level prevents growths, hence L-glutamic acid production
  2.    too high level prevents L-glutamic acid production
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 72. . Most productive species among the different vitamin B12 producing Pseudomonads is
  1.    P. denitrificans
  2.    P. ovalis
  3.    P. aureofaciens
  4.    none of these
 Discuss Question
Answer: Option A. -> P. denitrificans
Question 73. . The enzyme which converts optically active isomers of lactic acid to the optically inactive racemic mixture is
  1.    isomerase
  2.    racemase
  3.    dehydrogenase
  4.    invertase
 Discuss Question
Answer: Option B. -> racemase
Question 74. . Bacitracin, an antibiotic similar to penicillin, is produced by
  1.    Bacillus polymyxa
  2.    Streptomyces erythreus
  3.    Bacillus licheniformis
  4.    Aspergillus fumigatus
 Discuss Question
Answer: Option C. -> Bacillus licheniformis
Question 75. . The sugar concentration of molasses used in fermentation should be
  1.    10-18%
  2.    20-30%
  3.    4-5%
  4.    30-38%
 Discuss Question
Answer: Option A. -> 10-18%
Question 76. . Which of the following Ascomycetes are used for riboflavin production?
  1.    Eremnothecium ashbyii
  2.    Ashbya gossypii
  3.    Candida guilliermondia
  4.    Both (a) and (b)
 Discuss Question
Answer: Option D. -> Both (a) and (b)
Question 77. .  B. flavum strain can be used for the production of
  1.    L-Threonine
  2.    L-Proline
  3.    L-Isoleucine and L-Histidine
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 78. . A major organism used in commercial bioleaching for copper recovery is
  1.    Desulfovibrio desulfuricans
  2.    Pseudomonas aeruginosa
  3.    Aspergillus niger
  4.    Thiobacillus ferrooxidans
 Discuss Question
Answer: Option D. -> Thiobacillus ferrooxidans
Question 79. . During fermentation, pyruvic acid is converted into organic products such as
  1.    glucose and fructose
  2.    starch and cellulose
  3.    ethyl alcohol and lactic acid
  4.    citric acid and isocitric acid
 Discuss Question
Answer: Option C. -> ethyl alcohol and lactic acid
Question 80. . The major organism used in the microbial production of citric acid is
  1.    Penicillin notatum
  2.    Rhizopus nigrificins
  3.    Aspergillus niger
  4.    Lactobacillis delbrueckii
 Discuss Question
Answer: Option C. -> Aspergillus niger

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