Q. No.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. |
Which of the following antibiotics was discovered first?
1. Streptomycin
2. Neomycin
3. Erythromycin
4. Penicillin
The virus shown here is a causative agent of :
1. Intestinal infections
2. Respiratory infections
3. CNS infections
4. Genito-urinary infections
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. |
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 |
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.
A compound which is produced by an organism that inhibits growth of other organism is
called:
1. xenobiotics
2. antibiotic
3. antibody
4. interferon
Alexander Fleming accidently discovered antibiotic penicillin from a mould, but he was working on
1. Streptococci
2. Streptobacilli
3. Staphylobacilli
4. Staphylococci
| 1. | Clostridium | 2. | Trichoderma |
| 3. | Aspergillus | 4. | Saccharomyces |
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 gas.
3. Fermentation in muscle produces ethanol.
4. Toddy is made by fermenting sap from palms.
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