What would happen if oxygen availability to activated sludge flocs is reduced?

1. It will slow down the rate of degradation of organic matter.
2. The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.
3. Floes would increase in size as anaerobic bacteria would grow around floes.
4. Protozoa would grow in large numbers.

Subtopic:  Microbes in Sewage Treatment |
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Which of the following antibiotics was discovered first?
1. Streptomycin
2. Neomycin
3. Erythromycin
4. Penicillin

Subtopic:  Industrial Products, Beverages & Antibiotics |
 96%
From NCERT
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The virus shown here is a causative agent of :

1. Intestinal infections

2. Respiratory infections

3. CNS infections

4. Genito-urinary infections

Subtopic:  Industrial Products, Beverages & Antibiotics |
 81%
From NCERT
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Which of the following statements is correct?

1. Aspergillus niger is used for producing cyclosporin A.
2. Activated sludge is digested by aerobic bacteria to produce marsh gas.
3. Fleming, Chain & Florey were awarded with Nobel Prize for discovering penicillin.
4. BOD is amount of oxygen produced by bacteria on decomposition.
Subtopic:  Industrial Products, Beverages & Antibiotics |
 80%
From NCERT
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Which of the following option is not true for penicillin?

1. Its full potential as an effective antibiotic was established much later by Ernest Chain and Howard Florey.
2. This antibiotic was extensively used to treat American soldiers wounded in World War II.
3. Produced by the bacteria.
4. both 2 and 3
Subtopic:  Industrial Products, Beverages & Antibiotics |
 75%
From NCERT
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Select the correct statement

(1) Acetobacter aceti produces citric acid.

(2) Saccharomyces cerevisiae is used as clot buster

(3) Penicillium notanum restrict the growth of Staphylococci

(4) Methanogens are found in aerobic conditions.

 

Subtopic:  Industrial Products, Beverages & Antibiotics |
 77%
From NCERT
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A compound which is produced by an organism that inhibits growth of other organism is

called:

1. xenobiotics                         

2. antibiotic

3. antibody                             

4. interferon

Subtopic:  Industrial Products, Beverages & Antibiotics |
 79%
From NCERT
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Alexander Fleming accidently discovered antibiotic penicillin from a mould, but he was working on

1. Streptococci

2. Streptobacilli

3. Staphylobacilli

4. Staphylococci

Subtopic:  Industrial Products, Beverages & Antibiotics |
 71%
From NCERT
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Ethanol is commercially produced through a particular species of:
1. Clostridium 2. Trichoderma
3. Aspergillus 4. Saccharomyces
Subtopic:  Chemistry of Fermented Beverages |
 94%
From NCERT
AIPMT - 2011
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Which of the following statements is incorrect regarding fermentation ?

1. Propionibacterium is used to ferment the cheese.

2. The puffed-up appearance of dough is due to the production of CO2 gas. 

3. Fermentation in muscle produces ethanol.

4. Toddy is made by fermenting sap from palms.

Subtopic:  Chemistry of Fermented Beverages |
 85%
From NCERT
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