InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The purple sulphur bacteria use hydrogen sulphide and release sulphur but not oxygen. Which of the following agrees with above observationA. The `H_(2)` that resuces `CO_(2)` comes from `H_(2)S` that liberates sulphurB. Photosynthesis does not require chlorophyllC. Photosynthesis consist of a light and a dark reactionD. The `H_(2)` which reduces `CO_(2)` in photosynthesis comes from `H_(2)O` that releases `O_(2)` |
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Answer» Correct Answer - a `6CO_(2)+12H_(2)S overset("Light")(rarr) C_(6)H_(12)O_(6)+12S+6H_(2)O+` energy. Here `H_(2)S` is utilized as a source of hydrogen, which reduces `CO_(2)` into glucose. Oxygen is not liberated in bacterial photosynthesis. |
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| 2. |
Bacterial nucleoid consists ofA. one ssDNAB. one dsDNAC. two dsDNAD. many dsDNA |
| Answer» Correct Answer - B | |
| 3. |
The cell-wall material present only in bacteria and blue-green algae isA. pectinB. chitinC. muramic acidD. cellulose |
| Answer» Correct Answer - C | |
| 4. |
The membrane of which one of the following micro-organism is three layeredA. NostocB. MycoplasmaC. E. coliD. Rhodospirillum |
| Answer» Correct Answer - b | |
| 5. |
The membrane of which one of the following micro-organism is three layeredA. NostocB. ClostridiumC. E. coliD. Rhodosprillum |
| Answer» Correct Answer - B | |
| 6. |
Which one of the following organisms may respire in the absence of oxygenA. AzotobacterB. ClostridiumC. RhizobiumD. Lactobacillus |
| Answer» Correct Answer - b | |
| 7. |
Which one is the smallest organism capable of autonomous growth and reproduction Or Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygenA. VirusB. ViroidC. Mycoplasma (PPLO)D. None of the above |
| Answer» Correct Answer - c | |
| 8. |
Amphitrichous flagellation hasA. flagella absentB. flagella at one endC. flagella at both the endsD. flagella all around |
| Answer» Correct Answer - C | |
| 9. |
Nitrifying bacteria , Nitrosomonas and NitrobactorA. Convert (oxidize) ammonia or ammonium compounds into nitratesB. Convert nitrate into nitrogenC. Convert nitrogen into nitratesD. Convert dioxide into carbohydrates |
| Answer» Correct Answer - a | |
| 10. |
A mutant micro-organism unable to synthesize a compound required for it growth but able to grow if the compound is provided, is known asA. AuxotrophB. PrototrophC. AutotrophD. None of these |
| Answer» Correct Answer - a | |
| 11. |
Which of the species of mycoplasma causes human sterilityA. M. hominisB. M. fermentansC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - A | |
| 12. |
Consider the following statements and find the correct statements from the options given below. I. Amphitrichous flagella is found in Nitrosomonas. II. Lophotrichous flagella is found in Nitrosomonas. III. Red colour of redsea is due to the presence of Tricholdesmium erythraeum. IV. DNA of bacteria is known as genophore.A. I and IIB. II and IIIC. III and IVD. All of these |
| Answer» Correct Answer - D | |
| 13. |
Smallest bacteria isA. SpirilliumB. BasillusC. DialisterD. None of these |
| Answer» Correct Answer - c | |
| 14. |
Mycoplasma mycoides causes which of the following diseasesA. Boving pleuropneumoniaB. Inflammation of genitalsC. AgalactiaD. None of these |
| Answer» Correct Answer - a | |
| 15. |
Assertion : Pili are motile appendages of bacteria. Reason : Pili participate in conjugation.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and the reason are true and the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If the assertion is false but reason is true |
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Answer» Correct Answer - d In some bacteria, nonmotile appendages called pili or fimbriae are also present. They take part in sexual reproduction, i.e., conjugation. |
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| 16. |
Mycoplasma isA. Gram positiveB. Gram negativeC. Some species are gram positiveD. None of the above |
| Answer» Correct Answer - b | |
| 17. |
N-acetyl muramic acid is found asA. Cell wall component of plantB. Cell wall component of gram positive bacteriaC. Cell wall component of fungiD. Viral coat material |
| Answer» Correct Answer - b | |
| 18. |
Consider the following statements about mycoplasma and mark as true/false. I. They lack cell wall and pili. II. They contain circular ssDNA as genetic material. III. They lack histones. IV. They cause bunchy top of papaya in plants. Choose the correct option.A. `{:(I,II,III,IV),(F,T,T,T):}`B. `{:(I,II,III,IV),(T,T,T,F):}`C. `{:(I,II,III,IV),(T,F,T,F):}`D. `{:(I,II,III,IV),(F,F,F,T):}` |
| Answer» Correct Answer - C | |
| 19. |
Plasmids are extra chromosomal genetic material ofA. BacteriaB. VirusC. AlgaeD. Amoeba |
| Answer» Correct Answer - a | |
| 20. |
Assertion : Bacteria have three basic shapes, i.e., round, rod, spiral. Reason : Cocci and Bacilli may from clusters or chain of a definite length.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and the reason are true and the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If both the assertion and reason are false |
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Answer» Correct Answer - b Bacteria have different shapes spherical, rod, and spiral are three important type. Cocci may be in cluster or chain from or single and bacilli may be single, in pair in chain. |
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| 21. |
Muramic acid is present in the cell wall ofA. Bacteria/ Blue green algaeB. Green algaeC. YeastD. Rhizopus |
| Answer» Correct Answer - a | |
| 22. |
Which of the following is a genetic vectorA. PhageB. PlasmidC. MosquitoD. None of these |
| Answer» Correct Answer - b | |
| 23. |
Helically coiled shaped bacteria are calledA. SpirillaB. CocciC. BacilliD. Vibrio |
| Answer» Correct Answer - a | |
| 24. |
Which bacteria is responsible for the reduction of nitrates into nitrogen, (denitrifying Bacteria) in soilA. NitrosomonasB. PseudomonasC. RhizobiumD. Clostridium |
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Answer» Correct Answer - b Some bacteria such as thiobacillus denitrificans, Pseudomonas aoruginosa and Micrococcus denitrificans also occur in the soil which convert the nitrate and ammonia into atmospheric free elemental nitogen. |
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| 25. |
Nitrogen fixation by Nostoc /Anabaena takes place inA. heterocystsB. vegetative cellsC. akinetesD. hormogonia |
| Answer» Correct Answer - A | |
| 26. |
Nitrogen fixation by Nostoc /Anabaena takes place inA. HeterocystsB. Vegetative cellC. AkinetesD. Hormogonia |
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Answer» Correct Answer - a Heterocysts are airtight anaerobic bodies in which enzyme nitrogenase fixes atmospheric nitrogen. |
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| 27. |
Which of the following algae is symbiotic and nitrogen fixingA. SpirogyraB. CladophoraC. AnabaenaD. Oedogonium |
| Answer» Correct Answer - C | |
| 28. |
Which of the following is symbiotic nitrogen fixes ltbr. Or Which of the following can fix nitrogen in non-legu,inous plantsA. StreptomycesB. AnabaenaC. FrankiaD. Rhizobium |
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Answer» Correct Answer - c Actinomycetes are filamentous bacteria, inhabitant of soil. The genus Frankia causes nitrogen fixing nodules to form in older tree roots (non-legume plants). |
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| 29. |
Non-symbiotic nitrogen fixation takes place byA. Nostoc, Azotobacter, ClostridiumB. Anabena, Nostoc, RhizobiumC. Azotobacter, Nitrosomonas, RhizobiumD. Anabena, Nitrosomonas, Pseudomonas |
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Answer» Correct Answer - a Non-symbiotic nitrogen fixation takes place by Blue-green algae (Noetoc and Anabena) and free living soil bacteria (the Azotobacter species and the anaerobic Clostridium species). |
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| 30. |
Mucopeptide in cell wall is more inA. Gram-positive bacteriaB. Gram-negative bacteriaC. CyanobacteriaD. Bacteriophage |
| Answer» Correct Answer - a | |
| 31. |
In Gram positive bacteria, the peptidoglycan layer constitutesA. `10%` of the cell wallB. `30%` of the cell wallC. `70%` of the cell wallD. `90%` of the cell wall |
| Answer» Correct Answer - C | |
| 32. |
Which is not properly matched ?A. Azotobacter-Nitrogen fixationB. Streptococcus thermophilus - Yogurt preparationC. Chlorobium - PhotosynthesisD. Streptomyces rimosus - Chloromycitin |
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Answer» Correct Answer - D Streptomyces rimosus produces antibiotic called terramycin. Chloromycitin is produced by Streptomyces venezualae. |
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| 33. |
Assertion Eubacteria and archaebacteria have a same outer cell wall structure. Reason They both lack peptidoglycan in their cell wall.A. Both Assertion and Reason are true and Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is falseD. Assertion is false, but Reason is true |
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Answer» Correct Answer - C Both eubacteria and archaebacteria have cell wall covering the plasma membrane that strengthen the cell. The cell wall of eubacteria is made up of carbohydrate-protein complexes called peptidoglycan, which link together to create a strong mesh that gives the eubacterial cell wall a great strength. The cell wall of archaebacteria lacks peptidoglycan. |
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| 34. |
Peptidoglycan (mucopeptide is found in walls ofA. only Gram +ve bacteriaB. both Gramk +ve and -ve bacteriaC. Gram +ve and -ve bacteria and fungiD. bacteria and blue-green algae |
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Answer» Correct Answer - B The bacteria are classified depending upon their reaction to Gram stain. They are Gram position if, they take stain and Gram negative if do not take stain Peptidoglycan forms a structural network of cell wall, known as mucopeptide. Murein or mucopeptide is `70-80%` in Gram +ve and `10-20%` in Gram -ve bacteria. |
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| 35. |
Which of the following is a difference between bacteria and archaea?A. Archaea are unicellular and bacteria are colonialB. The genes of archaea have introns, whereas bacteria lack intronsC. They have different chemicals in their cell wallD. Bacteria are autotrophic and archaea are heterotrophic |
| Answer» Correct Answer - C | |
| 36. |
Bacteria are considered as plants, becauseA. These have a rigid cell wallB. They have a green colourC. They can reproduceD. They are present everywhere |
| Answer» Correct Answer - a | |
| 37. |
Assertion : Bacteria are classified among plants. Reason : They have cell walls.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and the reason are true and the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If both the assertion and reason are false |
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Answer» Correct Answer - a Plant cells are characterized by the presence of a rigid cell wall on the basis of which they can be differentiated from animal cells. Hence classified among plants. |
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| 38. |
Which one of the following groups of prokaryotes is classified as a member of the domain archaea?A. ActinomycetesB. SpirochaetesC. CyanobacteriaD. Methanogens |
| Answer» Correct Answer - D | |
| 39. |
Who classified bacteria under SchizomycetesA. NageliB. LinnaeusC. LeeuwenhoekD. Sadashivan |
| Answer» Correct Answer - a | |
| 40. |
The bacterial cell wall is not composed ofA. peptidoglycanB. lipidC. mutreinD. mucopeptide |
| Answer» Correct Answer - B | |
| 41. |
The chief component of bacterial cell wall isA. Cellulose and chitinB. Cellulose and pectinC. Amino acids and polysaccharidesD. Cellulose and carbohydrates |
| Answer» Correct Answer - c | |
| 42. |
Which is not a component of the bacterial cell wall?A. FatsB. MucopeptideC. CelluloseD. Non-cellulose polysaccharide |
| Answer» Correct Answer - C | |
| 43. |
Salmonella sp. IsA. MonotrichousB. LophotrichousC. AmphitrichousD. Peritrichous |
| Answer» Correct Answer - d | |
| 44. |
Teichoic acid is present in:-A. cell wall of Gram positive bacteriaB. cell wall of Gram negative bacteriaC. capsid of virusD. protoplam of mycoplasma |
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Answer» Correct Answer - A Teichoic acid is present in cell wall of Gram positive bacteria. It is acidic polymer consisting of carbohydrate, phosphate and an alcohol. It binds metals, acting as receptor sites for some viruses and maintaining cells at low pH to prevent degradation of cell wall by self produced enzymes. |
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| 45. |
In Gram negative bacterial cell wall, the preptidoglycan chains are laterally linked by short chains of four amino acids which are constituted ofA. L - Alanine, D - Glutamic acid, L -Lysine, D - alanineB. L - Alanine, D - Glutamic acid, diaminopimelic acid, D - AlanineC. L - Alanine, L-Lysine, D-Alanine, diaminopimelic acidD. L-Alanine, D- Glutamic, L-Lysine, diaminopimelic acid |
| Answer» Correct Answer - B | |
| 46. |
Choose the wrong statement regarding bacterial cell A. Glycocalyx is the outer most envlope in bacteria B. The glycocalyx could be a loose sheath called capsule C. The glycocalyx may be thick and tough called slime layer D. A special structure formed by the plasma membrane is called mesosome E. Small bristle like fibers sprouting out of the cell are called fimbriaeA. A and C are wrongB. A and B are wrongC. B and C are wrongD. A and D are wrong |
| Answer» Correct Answer - c | |
| 47. |
Bacteria are included in which of the following kingdomsA. ProtistaB. PlantaeC. MoneraD. Animalia |
| Answer» Correct Answer - c | |
| 48. |
Binding of magnesium ions by teichoic acids in bacterial cell wall protects bacteria fromA. drying injuriesB. thermal injuriesC. radiation injuriesD. physical injuries |
| Answer» Correct Answer - B | |
| 49. |
Antony Van Leeuwenhoek was first discovered bacteria. He belongs to which countryA. FranceB. SwedanC. HollandD. United Kingdom |
| Answer» Correct Answer - c | |
| 50. |
Consider the following four statement (1-4) and select the option which includes all the correct ones only (1) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc (2) Body weight-wise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins then the cows pe day (3) Common button mushrooms are a very rich source of vitamin C (4) A rich variety has been developed which is very rich in calciumA. Statement (3), (4)B. Statement (1), (3) and (4)C. Statements (2), (3) and (4)D. Statements (1), (2) |
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Answer» Correct Answer - d Spirulina is SCP rich in protein, vitamins and minerals and rice variety rich in iron constant. 250 gram biomass of Methylophilus methylotrophus produce 25 tonn protein/day while cow of 250 Kg produces only 200 gm protein/day. |
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