Microbes in Human Welfare

Topics in this chapter

• Industrial Microbial Products
• Microbial Bioactive Molecules
• Microbial Biocontrol Agents
• Biofertilizers and Mycorrhiza
• Wastewater Treatment and Biogas

Cheat sheet

Practice questions

1. Question 1Q-9A36B2

   Which of the following organisms is used in the commercial production of lactic acid?

   1. A.Aspergillus niger
   2. B.Lactobacillus
   3. C.Saccharomyces cerevisiae
   4. D.Acetobacter aceti
   See the answer and solution
2. Question 2Q-B418FD

   The large holes in 'Swiss cheese' are due to the production of a large amount of gas by which of the following?

   1. A.Propionibacterium sharmanii
   2. B.Trichoderma polysporum
   3. C.Monascus purpureus
   4. D.Clostridium butylicum
   See the answer and solution
3. Question 3Q-0B311D

   Cyclosporin A, an immunosuppressive agent used in organ transplant patients, is produced by:

   1. A.Monascus purpureus
   2. B.Penicillium notatum
   3. C.Trichoderma polysporum
   4. D.Aspergillus niger
   See the answer and solution
4. Question 4Q-0730AF

   Blood cholesterol-lowering agents called statins are commercially produced by:

   1. A.Yeast (Monascus purpureus)
   2. B.Bacterium (Acetobacter aceti)
   3. C.Fungus (Aspergillus niger)
   4. D.Cyanobacterium (Anabaena)
   See the answer and solution
5. Question 5Q-4C5C3D

   During sewage treatment, flocs refer to:

   1. A.Masses of bacteria associated with fungal filaments to form mesh-like structures.
   2. B.Primary sludge formed during sedimentation.
   3. C.Anaerobic sludge digesters producing biogas.
   4. D.The floating debris removed by sequential filtration.
   See the answer and solution