MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Bacteria knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For biosynthesis viruses use |
| A. | Specific receptors |
| B. | Lysozyme |
| C. | The mechanism called viropexia |
| D. | The synthetic machinery of host cell |
| Answer» E. | |
| 52. |
For penetration viruses use |
| A. | Specific receptors |
| B. | Lysozyme |
| C. | The mechanism called viropexia |
| D. | The synthetic machinery of host cell |
| Answer» D. The synthetic machinery of host cell | |
| 53. |
For adsorption viruses use |
| A. | Specific receptors |
| B. | Lysozyme |
| C. | The mechanism called viropexia |
| D. | The synthetic machinery of host cell |
| Answer» B. Lysozyme | |
| 54. |
For uncoating viruses use |
| A. | Specific receptors |
| B. | Lysozyme |
| C. | The mechanism called viropexia |
| D. | The synthetic machinery of host cell |
| Answer» C. The mechanism called viropexia | |
| 55. |
Capsid in nature is a |
| A. | Protein |
| B. | Lipid |
| C. | Polysaccharide |
| D. | Lipoprotein |
| Answer» B. Lipid | |
| 56. |
The capsid it is composed of |
| A. | Peplomers |
| B. | Nucleic acid |
| C. | Capsomers |
| D. | Envelope |
| Answer» D. Envelope | |
| 57. |
Which of the following is false about the general characteristics of viruses |
| A. | Do not possess cellular organization |
| B. | They are lack biosynthetic enzymes |
| C. | They are sensitive to antibiotics . |
| D. | They are multiply by complex process |
| Answer» D. They are multiply by complex process | |
| 58. |
Prions are |
| A. | Varuses are genetically deficient and so incapable of producing infections daughter virion |
| B. | Infective agents with protein free, with low molecular weight RNA |
| C. | Protein infections paticles , lack detectable nucleic acid. |
| D. | Extrachromosomal genetic elements |
| Answer» D. Extrachromosomal genetic elements | |
| 59. |
Defective viruses are |
| A. | Varuses are genetically deficient and so incapable of producing infections daughter virion. |
| B. | Infective agents with protein free, with low molecular weight RNA |
| C. | Protein infections particles , lack detectable nucleic acid |
| D. | Extrachromosomal genetic elements |
| Answer» B. Infective agents with protein free, with low molecular weight RNA | |
| 60. |
Which of the following is true about fungi |
| A. | Eukaryotes |
| B. | Prokaryotes |
| C. | Obligately parasitic |
| D. | Can t be grown on cell free media |
| Answer» B. Prokaryotes | |
| 61. |
Dark ground microscopy is used for detection of |
| A. | spirochetes |
| B. | chlamidia |
| C. | fangi |
| D. | virus |
| Answer» B. chlamidia | |
| 62. |
Which of the following is true about mycoplasma? |
| A. | Multiplication is by binary fission |
| B. | Totally devoid of cell wall |
| C. | Resistant to penicillin and its analogues |
| D. | All the above |
| Answer» E. | |
| 63. |
Chlamydias are |
| A. | non motile |
| B. | can t be grown on cell free media |
| C. | obligately parasitic |
| D. | All the above |
| Answer» E. | |
| 64. |
Viroids are |
| A. | Varuses are genetically deficient and so incapable of producing infections daughter virion |
| B. | Infective agents with protein free, with low molecular weight RNA. |
| C. | Protein infections particles , lack detectable nucleic acid |
| D. | Extrachromosomal genetic elements |
| Answer» C. Protein infections particles , lack detectable nucleic acid | |
| 65. |
Naked viruses are |
| A. | Enveloped |
| B. | Nonenveloped |
| C. | Varuses are genetically deficient and so incapable of producing infections daughter virion |
| D. | Infective agents with protein free, with low molecular weight RNA |
| Answer» C. Varuses are genetically deficient and so incapable of producing infections daughter virion | |
| 66. |
Which of the following is truth about envelope |
| A. | Derived from hast cell membrane |
| B. | Lipoprotein in nature |
| C. | Has projecting spikes on the surface |
| D. | All the above. |
| Answer» E. | |
| 67. |
Study of living microorganisms using |
| A. | hanging drop technique |
| B. | Gram s technique |
| C. | Burri s technique |
| D. | Morozov s technique |
| Answer» B. Gram s technique | |
| 68. |
To demonstrate capsule used |
| A. | Anjesky s staining |
| B. | Burri s technique |
| C. | Loefler s technique |
| D. | Morozov s staining |
| Answer» C. Loefler s technique | |
| 69. |
To demonstrate flagella used |
| A. | Anjesky s staining |
| B. | Burri s technique |
| C. | Loefler s technique |
| D. | Morozov s staining |
| Answer» E. | |
| 70. |
To demonstrate volutin granules used |
| A. | Anjesky s staining |
| B. | Burri s technique |
| C. | Loefler s technique |
| D. | Morozov s staining |
| Answer» D. Morozov s staining | |
| 71. |
Which of the following is a simple staining method |
| A. | Gram |
| B. | Neisser |
| C. | Zeil Nelsen |
| D. | Burri |
| Answer» E. | |
| 72. |
The spore protects the genomic DNA from |
| A. | intense heat |
| B. | chemical agents |
| C. | radiation |
| D. | all of the above |
| Answer» E. | |
| 73. |
Tasted material contain |
| A. | unknown antigen |
| B. | unknown antibody |
| C. | known antigen |
| D. | known antibody |
| Answer» B. unknown antibody | |
| 74. |
Zichl-Neelsen staning consist of |
| A. | 2 stages |
| B. | 4 stages |
| C. | 3 stages |
| D. | 5 stages |
| Answer» D. 5 stages | |
| 75. |
Gram s staining consist of |
| A. | 2 stages |
| B. | 4 stages |
| C. | 3 stages |
| D. | 5 stages |
| Answer» C. 3 stages | |
| 76. |
Fixation of the smear is necessary for |
| A. | to killed bacteria |
| B. | for preventing bacteria washing off during staining |
| C. | for best staining |
| D. | all of the above |
| Answer» E. | |
| 77. |
Gram positive microorganisms have |
| A. | violet color |
| B. | green color |
| C. | pink-red color |
| D. | black color |
| Answer» B. green color | |
| 78. |
Gram negative microorganisms |
| A. | violet color |
| B. | green color |
| C. | pink-red color |
| D. | black color |
| Answer» D. black color | |
| 79. |
A Gram positive bacterium retain crystal violet stain because |
| A. | cell wall include significant amount of teichoic and lipoteichoic acids |
| B. | bacteria have thick peptidoglycan layer |
| C. | periplasmie space is absent |
| D. | all of the above |
| Answer» E. | |
| 80. |
A Gram negative bacterium does not retain crystal violet stain because |
| A. | bacteria have thin peptidoglycan layer |
| B. | bacteria have thick peptidoglycan layer |
| C. | periplasmie space is absent |
| D. | cell wall include significant amount of teichoic and lipoteichoic acids |
| Answer» C. periplasmie space is absent | |
| 81. |
What is responsible for the endotoxin activity of LPS |
| A. | lipid A |
| B. | O antigen |
| C. | core polysaccharide |
| D. | all of the above |
| Answer» B. O antigen | |
| 82. |
Which of the following is true about structure Gramm negative cell wall |
| A. | thick peptidoglycan layer |
| B. | periplasmie space is absent |
| C. | include outer membrane |
| D. | All of the above |
| Answer» D. All of the above | |
| 83. |
Hemolytic serum for complement fixation reaction is obtained in the following manner |
| A. | rabbits are immunized by suspension of sheep erythrocytes |
| B. | sheep are immunized by suspension of rabbits erythrocytes |
| C. | guinea pig are immunized by suspension of sheep erythrocytes |
| D. | rabbits are immunized by suspension of guinea pig erythrocytes |
| Answer» B. sheep are immunized by suspension of rabbits erythrocytes | |
| 84. |
Which of the following about Fc fragment of antibodies is not truth |
| A. | posses antigen combining activity |
| B. | take part in complement fixation |
| C. | determines placental transfer |
| D. | determines skin fixation |
| Answer» B. take part in complement fixation | |
| 85. |
Which of the following is true about structure Gramm positive cell wall |
| A. | is composed of thick peptidoglycan layer |
| B. | periplasmie space is absent |
| C. | include significant amount of teichoic and lipoteichoic acids |
| D. | All of the above |
| Answer» E. | |
| 86. |
Positive result of the complement fixation reaction is expressed in |
| A. | complete inhibition of haemolysis |
| B. | complete haemolysis |
| C. | haemagglutination |
| D. | inhibition of haemagglutination |
| Answer» B. complete haemolysis | |
| 87. |
The organ of locomotion of bacteria is |
| A. | capsule |
| B. | flagella |
| C. | slime |
| D. | fimbriae |
| Answer» C. slime | |
| 88. |
Hemolytic system for complement fixation reaction consist of |
| A. | hemolytic serum |
| B. | 3 per cent suspension of sheep erythrocytes |
| C. | 5 per cent suspension of human erythrocytes |
| D. | 3 per cent suspension of sheep erythrocytes and hemolytic serum |
| Answer» E. | |
| 89. |
Patient serum contain |
| A. | unknown antigen |
| B. | unknown antibody |
| C. | known antigen |
| D. | known antibody |
| Answer» E. | |
| 90. |
How many systems does include the complement fixation reaction |
| A. | 2 systems |
| B. | 4 systems |
| C. | 3 systems |
| D. | 5 systems |
| Answer» B. 4 systems | |
| 91. |
The first system of the complement fixation reaction consist of |
| A. | an antigen, complement, sheep erythrocytes |
| B. | an antibody, complement, hemolytic serum |
| C. | an antigen, complement, sheep erythrocytes, hemolytic serum |
| D. | an antigen, an antibody, complement |
| Answer» E. | |
| 92. |
Lysis reaction is a |
| A. | spirochetolysis |
| B. | haemolisis |
| C. | vibrionolysis |
| D. | all of the b v |
| Answer» E. | |
| 93. |
Strict anaerobes lack following enzymes |
| A. | Catalase |
| B. | Peroxidase |
| C. | Superoxide dismutase |
| D. | All the above |
| Answer» E. | |
| 94. |
LPS (endotoxin) consist of |
| A. | lipid A |
| B. | O antigen |
| C. | core polysaccharide |
| D. | all of the above |
| Answer» E. | |
| 95. |
To demonstrate bacterial spores used |
| A. | Anjesky s staining |
| B. | Burri s technique |
| C. | Loefler s technique |
| D. | Morozov s staining |
| Answer» B. Burri s technique | |
| 96. |
The spore has |
| A. | inner membrane |
| B. | outerkeratin- like coat |
| C. | two peptidoglican layers |
| D. | all of the above |
| Answer» E. | |
| 97. |
Negative result of the complement fixation reaction is expressed in |
| A. | complete inhibition of haemolysis |
| B. | complete haemolysis |
| C. | haemagglutination |
| D. | inhibition of haemagglutination |
| Answer» C. haemagglutination | |
| 98. |
Diagnostic serum contain |
| A. | unknown antigen |
| B. | unknown antibody |
| C. | known antigen |
| D. | known antibody |
| Answer» E. | |
| 99. |
Which of these is exposed on the outer surface of a gram-negative bacterium? |
| A. | Braun lipoprotein |
| B. | O-antigen of lipopolysaccharide (LPS) |
| C. | Polysaccharide portion of lipoteichoic acid (LTA) |
| D. | Electron transport system components |
| Answer» C. Polysaccharide portion of lipoteichoic acid (LTA) | |
| 100. |
Transformation is |
| A. | the transfer of genetic information trough the agency of free DNA |
| B. | the transfer of a portion of the DNA from one of bacterium to another by a bacteriophage |
| C. | the transfer of genes from donor cell to recipient by means of physical contact |
| D. | a random, undirected, heritable variation caused by an alteration in the nucleotide sequence at some point of the DNA of the cell |
| Answer» B. the transfer of a portion of the DNA from one of bacterium to another by a bacteriophage | |