MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is commonly used as Gram's decolouriser? |
| A. | Ethyl alcohol |
| B. | Methyl alcohol |
| C. | Acetone |
| D. | A mixture of ethyl alcohol and acetone |
| Answer» E. | |
| 2. |
Which of the following organisms can be demonstrated with silver impregnation method? |
| A. | Vibrios |
| B. | Salmonella |
| C. | Spirochaetes |
| D. | Shigella |
| Answer» D. Shigella | |
| 3. |
The organism which grows best above 45°C are called |
| A. | psychrophilic |
| B. | mesosphilic |
| C. | thermophilic |
| D. | any of these |
| Answer» D. any of these | |
| 4. |
What is the colour of gram -postive bacteria on a gram staining? |
| A. | Purple |
| B. | Pink |
| C. | Colourless |
| D. | Green |
| Answer» B. Pink | |
| 5. |
Nutrient content and biological structures are considered as |
| A. | implicit factor for microbial growth |
| B. | intrinsic factor for microbial growth |
| C. | processing factor |
| D. | none of the above |
| Answer» C. processing factor | |
| 6. |
Coagulase-reacting factor is necessary for |
| A. | slide coagulase test |
| B. | tube coagulase test |
| C. | precipitation test |
| D. | none of these |
| Answer» C. precipitation test | |
| 7. |
Medusa head appearance of the colonies may be due to |
| A. | Bacillus anthracis |
| B. | Proteus mirabilis |
| C. | Clostridium tetani |
| D. | Pseudomonas aeruginosa |
| Answer» B. Proteus mirabilis | |
| 8. |
A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the |
| A. | organism are aerobes |
| B. | organism should be grown in an anaerobic chamber |
| C. | organism cannot produce superoxide dismutase and/or catalase |
| D. | organism cannot tolerate oxygen |
| Answer» B. organism should be grown in an anaerobic chamber | |
| 9. |
Nagler's reaction is useful for the identification of |
| A. | C tetani |
| B. | C perfringens |
| C. | C botulinum |
| D. | C difficile |
| Answer» C. C botulinum | |
| 10. |
Bacteria belonging to the genus Legionella contains which of the following amino acid? |
| A. | Lysine |
| B. | Arginine |
| C. | Glycine |
| D. | Cysteine |
| Answer» E. | |
| 11. |
Starvation proteins are produced by a culture during which of the following segments of the growth curve? |
| A. | Lag phase |
| B. | Exponential phase |
| C. | Stationary phase |
| D. | Death phase |
| Answer» D. Death phase | |
| 12. |
Classical typhus fever is transmitted by which of the following arthropod? |
| A. | ticks |
| B. | mites |
| C. | fleas |
| D. | lice |
| Answer» E. | |
| 13. |
Cells of Arthrobacter in the stationary phase of growth are ____________ shaped. |
| A. | rod |
| B. | irregularly |
| C. | coccoid |
| D. | rudimentary branching |
| Answer» D. rudimentary branching | |
| 14. |
The family Micrococcaceae do not exhibit any unusual resistance to gamma and ultraviolet radiation. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 15. |
The bacteria which cause(s) tuberculosis in man is/are |
| A. | M bovis |
| B. | Mycobacterium tuberculosis |
| C. | M africanum |
| D. | All of these |
| Answer» E. | |
| 16. |
Which genus among the following has certain similarities to the genus Bdellovibrio? |
| A. | Azospirillum |
| B. | Oceanospirillum |
| C. | Campylobacter |
| D. | Vamprirovibrio |
| Answer» E. | |
| 17. |
Which of the following have peritrichous flagella? |
| A. | Acetobacter |
| B. | Gluconobacter |
| C. | Agrobacteria |
| D. | Rhizobium |
| Answer» B. Gluconobacter | |
| 18. |
Thermus thermopiles is a |
| A. | gram negative eubacteria |
| B. | gram positive eubacteria |
| C. | gram negative archebacteria |
| D. | gram positive archebacteria |
| Answer» B. gram positive eubacteria | |
| 19. |
The causative agent of leprosy is ________________ |
| A. | M.intracellulare |
| B. | M.leprae |
| C. | M.kansasii |
| D. | M.phlei |
| Answer» C. M.kansasii | |
| 20. |
Drumstick appearance is characteristic of |
| A. | C tetanomorphum |
| B. | C tetani |
| C. | C sphenoides |
| D. | all of these |
| Answer» E. | |
| 21. |
Which of the following(s) is/ are oxidase-positive bacteria? |
| A. | Vibrio |
| B. | Neisseria |
| C. | Pseudomonas |
| D. | All of these |
| Answer» E. | |
| 22. |
Which of the phage types of Mycobacterium tuberculosis occurs most frequently in India? |
| A. | Type A |
| B. | Type B |
| C. | Type C |
| D. | Type I |
| Answer» E. | |
| 23. |
Which of the following(s) show(s) positive results for phenylalanine deaminase test? |
| A. | Providencia |
| B. | Proteus |
| C. | Morganella |
| D. | All of these |
| Answer» E. | |
| 24. |
__________ is specifically able to have a long-term relationship with the host known as lysogeny. |
| A. | Temperate virus |
| B. | Adsorbed virus |
| C. | RNA phage |
| D. | DNA phage |
| Answer» B. Adsorbed virus | |
| 25. |
Bacteria of genus Nitrosomonas use __________ as their electron source. |
| A. | ammonia |
| B. | H2S |
| C. | succinate |
| D. | light |
| Answer» B. H2S | |
| 26. |
The DNA coding for the production of cholera toxin in Vibrio cholerae is on the |
| A. | phage |
| B. | plasmid |
| C. | chromosome |
| D. | transposon |
| Answer» D. transposon | |
| 27. |
Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media? |
| A. | Coulter Counter |
| B. | Hemostat |
| C. | Petroff-Hausser chamber |
| D. | Trubidostat |
| Answer» E. | |
| 28. |
Among the given families, which family contains organisms that are non-motile? |
| A. | Enterobacteriaceae |
| B. | Vibrionaceae |
| C. | Pseudomonadaceae |
| D. | Pasteurellaceae |
| Answer» E. | |
| 29. |
The X factor and/or the V factor is required by which genus of bacteria? |
| A. | Pasteurella |
| B. | Haemophilus |
| C. | Actinobacillus |
| D. | Zymomonas |
| Answer» C. Actinobacillus | |
| 30. |
Which of the following genus shows the characteristic of bioluminescence? |
| A. | Aeromonas |
| B. | Zymomonas |
| C. | Vibrio |
| D. | Haemophilus |
| Answer» D. Haemophilus | |
| 31. |
Bacteria belonging to the family Bacteriodaceae uses which of the following compounds as electron acceptors? |
| A. | oxygen |
| B. | inorganic sulphur |
| C. | nitrate |
| D. | phosphate |
| Answer» D. phosphate | |
| 32. |
The family Vibrionaceae is _________________ |
| A. | oxidase-positive |
| B. | oxidase-negative |
| C. | coccus shaped |
| D. | non-motile |
| Answer» B. oxidase-negative | |
| 33. |
Which of the following has peptidoglycan as a major constituent of cell wall? |
| A. | Gram-negative bacteria |
| B. | Gram-positive bacteria |
| C. | Fungi |
| D. | None of these |
| Answer» C. Fungi | |
| 34. |
Chemically the capsule may be |
| A. | polypeptide |
| B. | polysaccharide |
| C. | either (a) or (b) |
| D. | none of these |
| Answer» D. none of these | |
| 35. |
The protein from which hook and filaments of flagella are composed of, is |
| A. | keratin |
| B. | flagellin |
| C. | gelatin |
| D. | casein |
| Answer» C. gelatin | |
| 36. |
Which of the following does not contain protein? |
| A. | Pili |
| B. | Flagellum |
| C. | Lipoteichoic acid |
| D. | Porin |
| Answer» D. Porin | |
| 37. |
Peptidoglycan is also known as |
| A. | N-acetyl muramic acid |
| B. | murein mucopeptide |
| C. | N acetylglucosamine |
| D. | mesodiaminopimetic acid |
| Answer» C. N acetylglucosamine | |
| 38. |
The cell wall of |
| A. | gram-positive bacteria are thicker than gram-negative bacteria |
| B. | gram-negative bacteria are thicker than gram-positive bacteria |
| C. | both have same thickness but composition is different |
| D. | none of these |
| Answer» B. gram-negative bacteria are thicker than gram-positive bacteria | |
| 39. |
The bacteria deficient in cell wall is |
| A. | Treponema |
| B. | Mycoplasma |
| C. | Staphylococcus |
| D. | Klebsiella |
| Answer» C. Staphylococcus | |
| 40. |
Toxin produced by some bacterial species that is lethal to other bacterias is named as |
| A. | Bacteriocins |
| B. | Bacterial toxin |
| C. | Poison |
| D. | Lethal secretion |
| Answer» B. Bacterial toxin | |
| 41. |
Size of bacteria ranges from |
| A. | 0.2-5 µm |
| B. | 0.3-4 µm |
| C. | 0.02-0.2 µm |
| D. | 0.2-0.4 µm |
| Answer» B. 0.3-4 µm | |
| 42. |
Approximate number of gene in prokaryotic 'DNA' is |
| A. | 200 |
| B. | 2000 |
| C. | 2500 |
| D. | 2100 |
| Answer» C. 2500 | |
| 43. |
'flagellum' is made up of |
| A. | Sugars |
| B. | Lipids |
| C. | Polysaccharides |
| D. | Proteins |
| Answer» E. | |
| 44. |
The cocci which forms a chain is |
| A. | Streptococci |
| B. | diplococci |
| C. | Staphylococci |
| D. | Tetracocci |
| Answer» B. diplococci | |
| 45. |
Which of the following is analogous to mesosomes of bacteria? |
| A. | Mitochondria of eukaryotes |
| B. | Golgi apparatus of eukaryotes |
| C. | Lysosomes of eukaryotes |
| D. | None of these |
| Answer» B. Golgi apparatus of eukaryotes | |
| 46. |
On basis of shape 'bacterias' are classified into |
| A. | 2 Groups |
| B. | 3 Groups |
| C. | 4 Groups |
| D. | 5 Groups |
| Answer» C. 4 Groups | |
| 47. |
Peptidoglycan accounts for __________ of the dry weight of cell wall in many gram positive bacteria |
| A. | 50% or more |
| B. | About 10% |
| C. | 11%+ 0.22% |
| D. | About 20% |
| Answer» B. About 10% | |
| 48. |
Gram positive cells have a |
| A. | second outer membrane that helps to retain the crystal violet stain |
| B. | multiple layer of peptidoglycan that helps to retain the crystal violet stain |
| C. | thick capsule that traps the crystal violet stain |
| D. | periplasmic space that traps the crystal violet |
| Answer» C. thick capsule that traps the crystal violet stain | |
| 49. |
Which of the following may be most likely to be missing from a gram-positive bacterium? |
| A. | Penicillin binding protein |
| B. | Peptidoglycan |
| C. | Lipopolysaccharide |
| D. | Phospholipid bilayer membrane |
| Answer» D. Phospholipid bilayer membrane | |
| 50. |
Which of the following factors are responsible for the stability of thermophiles at high temperatures? |
| A. | increased leakage of cell components |
| B. | presence of large no. of polar amino acids and alpha-helix protein |
| C. | thermal stability of ribosomes |
| D. | presence of Inositol diphosphate and thermal stability of ribosomes |
| Answer» E. | |