MCQOPTIONS
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MCQOPTIONS
This section includes 334 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which of the following viruses has not been associated with human cancer? |
| A. | Hepatitis C virus |
| B. | Hepatitis B virus |
| C. | Varicella-Zoster virus |
| D. | Herpes simplex virus type 2 |
| Answer» D. Herpes simplex virus type 2 | |
| 52. |
Viruses belonging to which of following class can have their RNA genome act directly as mRNA in host? |
| A. | IV |
| B. | V |
| C. | III |
| D. | II |
| Answer» B. V | |
| 53. |
Group E phages have |
| A. | single stranded DNA |
| B. | double stranded DNA |
| C. | single stranded RNA |
| D. | double stranded DNA |
| Answer» D. double stranded DNA | |
| 54. |
Smallest viruses can have how many genes? |
| A. | 10 |
| B. | 20 |
| C. | 3 |
| D. | 90 |
| Answer» D. 90 | |
| 55. |
The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in |
| A. | lysogeny |
| B. | spontaneous induction |
| C. | lytic phase |
| D. | none of these |
| Answer» B. spontaneous induction | |
| 56. |
Size of 'deltavirus' is |
| A. | 37 nm |
| B. | 67 nm |
| C. | 45 nm |
| D. | 69 nm |
| Answer» B. 67 nm | |
| 57. |
Parvovirus, papovavirus and adenovirus are three |
| A. | Enveloped |
| B. | Naked |
| C. | Coated |
| D. | Capsid |
| Answer» C. Coated | |
| 58. |
'Rhabdoviruses' is also named as |
| A. | Rotavirus |
| B. | Measles virus |
| C. | Mumps virus |
| D. | Rabies virus |
| Answer» E. | |
| 59. |
Varicella-zoster virus causes which of following diseases? |
| A. | chicken pox |
| B. | common cold |
| C. | diarrhea |
| D. | hemorrhage |
| Answer» B. common cold | |
| 60. |
If a woman inherits one mutant BRCA allele, what are her chances of developing breast cancer? |
| A. | 0.6 |
| B. | 0.3 |
| C. | 0.1 |
| D. | none |
| Answer» B. 0.3 | |
| 61. |
Smallest RNA virus with diameter 28 nm is called |
| A. | Parvovirus |
| B. | Papovavirus |
| C. | Picornavirus |
| D. | Reovirus |
| Answer» D. Reovirus | |
| 62. |
Which of following describes prions? |
| A. | proteins |
| B. | circular RNA |
| C. | linear RNA |
| D. | circular DNA |
| Answer» B. circular RNA | |
| 63. |
Rotavirus causes which of following diseases? |
| A. | hemorrhage |
| B. | diarrhea |
| C. | chicken pox |
| D. | common cold |
| Answer» C. chicken pox | |
| 64. |
Hepatitis G virus belongs to the family |
| A. | Caliciviridae |
| B. | Flaviviridae |
| C. | Hepadnaviridae |
| D. | Coronaviridae |
| Answer» C. Hepadnaviridae | |
| 65. |
Which of following is another name for rod-shaped viruses? |
| A. | cylindrical |
| B. | helical |
| C. | elongated |
| D. | circular |
| Answer» C. elongated | |
| 66. |
Viruses that are defective, having proteins and nucleic acid, but, cannot replicate without |
| A. | Bacteriophage |
| B. | Virion |
| C. | Prion |
| D. | Helper virus |
| Answer» E. | |
| 67. |
Which of the following antigenic types of hepatitis B virus is present in the envelope? |
| A. | HbsAg |
| B. | HBcAg |
| C. | HBeAg |
| D. | HBxAg |
| Answer» B. HBcAg | |
| 68. |
Size range of 'virus' is |
| A. | 20-300 nm |
| B. | 50-300nm |
| C. | 40-300nm |
| D. | 80-350nm |
| Answer» B. 50-300nm | |
| 69. |
Which of following is an example of a retrovirus? |
| A. | Human Immunodeficiency Virus (HIV) |
| B. | picoRNAvirus |
| C. | coronavirus |
| D. | flavivirus |
| Answer» B. picoRNAvirus | |
| 70. |
How much time would it take to complete entire lytic cycle of T4 phage? |
| A. | 30 mins |
| B. | 1 hour |
| C. | 9 hours |
| D. | 1 week |
| Answer» B. 1 hour | |
| 71. |
'Herpesvirus' are noted, in causing |
| A. | Latent infection |
| B. | Cancer |
| C. | Scrapie |
| D. | Scratches |
| Answer» B. Cancer | |
| 72. |
Which of following viruses has an ssRNA genome that functions as a template for DNA synthesis? |
| A. | picoRNAvirus |
| B. | coronavirus |
| C. | flavivirus |
| D. | retrovirus |
| Answer» E. | |
| 73. |
Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in |
| A. | immediate early phage genes |
| B. | late genes |
| C. | delayed early genes |
| D. | all of these |
| Answer» C. delayed early genes | |
| 74. |
The most serious infection is |
| A. | superinfection of an HBsAg carrier by HDV |
| B. | infection with HBV alone |
| C. | coinfection of HBVand HDV |
| D. | none of the above |
| Answer» B. infection with HBV alone | |
| 75. |
Missing function of defective viruses, provided by help of |
| A. | Helper virus |
| B. | Virion |
| C. | Prion |
| D. | Bacteriophages |
| Answer» B. Virion | |
| 76. |
Small naked single-stranded linear 'DNA' virus, having 22 nm size, is called |
| A. | Papovavirus |
| B. | Poxvirus |
| C. | Parvovirus |
| D. | Adenovirus |
| Answer» D. Adenovirus | |
| 77. |
The hepadnaviruses such as hepatitis B virus are quite different from other DNA viruses with respect to genome replication. These replicate their DNA using |
| A. | DNA-dependent DNA polymerase |
| B. | reverse transcriptase |
| C. | Rnase H |
| D. | DNA ligase |
| Answer» C. Rnase H | |
| 78. |
Which of following is another name for multidrug treatment? |
| A. | polydrug |
| B. | cocktail |
| C. | amalgam |
| D. | mixture |
| Answer» D. mixture | |
| 79. |
Kuru disease was first identified in which of following areas? |
| A. | Honolulu |
| B. | united states |
| C. | Pakistan |
| D. | new guinea |
| Answer» E. | |
| 80. |
Which of the following hepatitis viruses is not RNA virus? |
| A. | Hepatitis A virus |
| B. | Hepatitis B virus |
| C. | Hepatitis E virus |
| D. | Hepatitis G virus |
| Answer» C. Hepatitis E virus | |
| 81. |
The development of hepatocellular carcinoma is associated with |
| A. | ground squirrel hepatitis virus |
| B. | hepatitis B virus |
| C. | woodchuck hepatitis virus |
| D. | all of the above |
| Answer» E. | |
| 82. |
The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called |
| A. | immunity repressor |
| B. | immunity operon |
| C. | operon repressor |
| D. | none of these |
| Answer» B. immunity operon | |
| 83. |
Prions' are remarkably resistant to formaldehyde and |
| A. | Acids |
| B. | Nucleases |
| C. | Bases |
| D. | Buffers |
| Answer» C. Bases | |
| 84. |
The virus(es) which can cause aseptic meningitis is/are |
| A. | Polioviruses |
| B. | Coxsackieviruses |
| C. | Echo viruses |
| D. | All of these |
| Answer» E. | |
| 85. |
Term 'borrowed life' fits on which of following organisms? |
| A. | bacteria |
| B. | archaea |
| C. | protists |
| D. | viruses |
| Answer» E. | |
| 86. |
The oncogene theory refers to |
| A. | how chemicals inactivate viruses when applied |
| B. | how viruses replicate in host cells |
| C. | how viruses transform normal cells into tumor cells |
| D. | none of these |
| Answer» D. none of these | |
| 87. |
Which of following is second most common cancer in United States? |
| A. | colorectal cancer |
| B. | lung cancer |
| C. | breast cancer |
| D. | blood cancer |
| Answer» D. blood cancer | |
| 88. |
Transmission of Molluscum contagiosum virus is through |
| A. | direct contact |
| B. | sexual contact |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 89. |
All helical viruses are enclosed in 'nucleocapsid' known as |
| A. | Cell wall |
| B. | Cell membrane |
| C. | Envelop |
| D. | Boundary |
| Answer» D. Boundary | |
| 90. |
Which of following defines life cycle of virus that results in death of host cell? |
| A. | complete cycle |
| B. | lysogenic cycle |
| C. | lytic cycle |
| D. | apoptotic cycle |
| Answer» D. apoptotic cycle | |
| 91. |
Which of following is an example of a viroid disease? |
| A. | potato spindle tuber |
| B. | kuru |
| C. | Cadang-cadang |
| D. | tobacco mosaic infection |
| Answer» D. tobacco mosaic infection | |
| 92. |
Papillomaviruses are associated with which of following cancers? |
| A. | adult leukemia |
| B. | cervical cancer |
| C. | Burkitt's lymphoma |
| D. | breast cancer |
| Answer» C. Burkitt's lymphoma | |
| 93. |
Which of following describes a disease which is persistently present in a population? |
| A. | endemic |
| B. | pandemic |
| C. | epidemic |
| D. | outbreak |
| Answer» B. pandemic | |
| 94. |
Which of following describes a widespread outbreak of disease? |
| A. | pandemic |
| B. | epidemic |
| C. | outbreak |
| D. | endemic |
| Answer» C. outbreak | |
| 95. |
What is approximate size of parvovirus ? |
| A. | 23 nm |
| B. | 21 nm |
| C. | 22 nm |
| D. | 20 nm |
| Answer» D. 20 nm | |
| 96. |
'Dengue' virus is member of a family, called |
| A. | Parvovirus |
| B. | Flaviviruses |
| C. | Picornavirus |
| D. | hepadnavirus |
| Answer» C. Picornavirus | |
| 97. |
In family of Rhabdoviruses, only human pathogens is |
| A. | Rotavirus |
| B. | Rabies virus |
| C. | Mumps virus |
| D. | Measles virus |
| Answer» C. Mumps virus | |
| 98. |
Severe acute respiratory 'syndrome' in human is caused by |
| A. | Arenavirus |
| B. | Coronavirus |
| C. | Picornavirus |
| D. | Rhabdoviruses |
| Answer» C. Picornavirus | |
| 99. |
Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of |
| A. | self-replication |
| B. | duplication |
| C. | self-duplication |
| D. | multiplication |
| Answer» B. duplication | |
| 100. |
Which of following is first sign of colorectal cancer? |
| A. | bleeding |
| B. | polyp |
| C. | inflammation |
| D. | swollen lymph nodes |
| Answer» C. inflammation | |