Citric acid is produced by:

(1) Acetobacter aceti (a bacterium)

(2) Yeast (a fungus)

(3) Aspergillus niger (a fungus)

(4) Streptococcus (a bacterium)

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules |
 88%
From NCERT
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Which of the following bacteria has a role in removing clots from the blood vessels?

1. Bacillus thuringiensis

2. Clostridium butylicum

3. Streptococcus

4. Lactobacillus

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules |
 93%
From NCERT
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Statins used for lowering blood-cholesterol level are extracted from:

(1) Algae

(2) Bacteria

(3) Virus

(4) Yeast

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules |
 75%
From NCERT
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The bioactive molecule cyclosporin A is used in:

1. Whooping cough

2. Diphtheria

3. Leprosy

4. Organ-transplant patients

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules |
 96%
From NCERT
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Cyclosporin A is produced from:

(1) Trichoderma polysporum (a fungus)

(2) Bacillus (a bacterium)

(3) Aspergillus (a fungus)

(4) All of these

Subtopic:  Chemicals, Enzymes & Other Bioactive Molecules |
 95%
From NCERT
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The primary treatment of sewage involves:

1. Digestion

2. Decomposition

3. Sedimentation and filtration

4. None of these

Subtopic:  Microbes in Sewage Treatment |
 96%
From NCERT
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The amount of oxygen required by the microbes in the decomposition of organic matter is called:

1. Chemical oxygen demand

2. Biochemical oxygen demand

3. Total oxygen demand

4. Dissolve oxygen

Subtopic:  Microbes in Sewage Treatment |
 96%
From NCERT
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The mixture of gases released during anaerobic digestion of sludge is called:

(1) Methane

(2) Carbon dioxide

(3) Biogas

(4) Flammable gases

Subtopic:  Microbes in Production of Biogas |
 83%
From NCERT
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Biogas contains:

(1) CO2

(2) H2S

(3) CH4

(4) All of these

Subtopic:  Microbes in Production of Biogas |
 97%
From NCERT
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The symbiotic association between fungi and roots of higher plants is called:

1. Lichen

2. Mycorrhiza

3. Biofertilizer

4. BOD

Subtopic:  Microbes as Biofertilizer |
 94%
From NCERT
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