

MCQOPTIONS
This section includes 126 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
51. |
Litmus used as an indicator for acids and bases is extracted from |
A. | Lichens |
B. | Virus |
C. | Plants |
D. | Bacteria |
Answer» B. Virus | |
52. |
The sole members of kingdom Monera are |
A. | Mushrooms |
B. | Virus |
C. | Algae |
D. | Bacteria |
Answer» E. | |
53. |
Which of the following does not have the capacity to reproduce outside the host cell? |
A. | Bacteria |
B. | Fungi |
C. | Algae |
D. | Virus |
Answer» E. | |
54. |
Pencillium from which an antibiotic is obtained is a type of |
A. | Bacteria |
B. | Virus |
C. | Algae |
D. | Fungus |
Answer» E. | |
55. |
What type of microorganism is yeast which is used in many food preparations? |
A. | Bacteria |
B. | Fungi |
C. | Algae |
D. | Virus |
Answer» C. Algae | |
56. |
Which of these is a saprotroph? |
A. | Algae |
B. | Pitcher plant |
C. | Fungi |
D. | Cuscuta |
Answer» D. Cuscuta | |
57. |
Prokaryotes do not have |
A. | Cytoplasm |
B. | Ribosome |
C. | Nuclear membrane |
D. | Chromosomes |
Answer» D. Chromosomes | |
58. |
Rhizobium bacteria are present in the _____ of leguminous plants. |
A. | Roots |
B. | Leaves |
C. | Fruits |
D. | Flowers |
Answer» B. Leaves | |
59. |
In order to take precautionary steps to control dengue, we must take measures to stop the breeding of: |
A. | Aedes mosquito |
B. | Fleas |
C. | Fire ants |
D. | Anopheles mosquito |
Answer» B. Fleas | |
60. |
Some plants have nitrogen-fixing bacteria in their root nodules. What are these bacteria called? |
A. | Blue green algae |
B. | Nitrosomonas |
C. | Azotobacter |
D. | Rhizobium |
Answer» E. | |
61. |
Which of the following diseases is caused by a bacteria? |
A. | Chicken pox |
B. | Tuberculosis |
C. | Dengue |
D. | Polio |
Answer» C. Dengue | |
62. |
Alcohol is produced with the help of |
A. | sodium chloride |
B. | yeast |
C. | nitrogen |
D. | carbon dioxide |
Answer» C. nitrogen | |
63. |
Which of the following drug is an antipyretic? |
A. | Insulin |
B. | Alcohol |
C. | Streptomycin |
D. | Paracetamol |
Answer» E. | |
64. |
Which of the following is a characteristic unique to the ciliates? |
A. | Use of cilia as a sensory function |
B. | Presence of both a macronucleus and several micronuclei |
C. | Both (a) and (b) |
D. | Possess a light-detecting eye spot |
Answer» D. Possess a light-detecting eye spot | |
65. |
The binomial name of a microbe is composed of |
A. | its kingdom and genus names |
B. | its genus name and a species modifier |
C. | its family and class names |
D. | its genus and species names |
Answer» C. its family and class names | |
66. |
Which of the following structure is present in prokaryotic cells? |
A. | Mitochondria |
B. | Chloroplasts |
C. | Golgi structure |
D. | Mesosome |
Answer» E. | |
67. |
In the three domain system of classification, the traditional bacteria are placed in the |
A. | eukarya |
B. | archaea |
C. | eubacteria |
D. | none of these |
Answer» D. none of these | |
68. |
One of the reasons for the evolutionary success of the kingdom Monera is that its members are nutritionally diverse. Which of the following(s) is/are the way(s) of obtaining energy? |
A. | Photoautotrophy |
B. | Photoheterotrophy |
C. | Chemoheterotrophy |
D. | All of the above |
Answer» E. | |
69. |
Carl Woese and his colleague are best known for establishing |
A. | the five kingdom system |
B. | the three domain system |
C. | the prokaryote-eukaryote system |
D. | the plant-animal system |
Answer» C. the prokaryote-eukaryote system | |
70. |
Which of the following is the most primitive? |
A. | Virus |
B. | Eukaryote |
C. | Archaeon |
D. | Mitochondria |
Answer» D. Mitochondria | |
71. |
All the following are basic properties of cells except |
A. | cells have nuclei and mitochondria |
B. | cells have a genetic programme and the means to use it |
C. | cells are capable of producing more of themselves |
D. | cells are able to respond to stimuli |
Answer» B. cells have a genetic programme and the means to use it | |
72. |
The individual best remembered for bringing microbes to the world is |
A. | Robert Hooke |
B. | Antony Van Leeuenhoek |
C. | Robert Koch |
D. | Masaki Ogata |
Answer» C. Robert Koch | |
73. |
Which of the following microorganisms is classified as a member of archaebacteria? |
A. | Gyanobacteria |
B. | Methanobacteria |
C. | Trichomonads |
D. | Mycoplasma |
Answer» C. Trichomonads | |
74. |
The first organism in most natural food chains is |
A. | a herbivore |
B. | a decomposer |
C. | photosynthetic |
D. | carnivorous |
Answer» B. a decomposer | |
75. |
The third kingdom, protista, as suggested by E.H. Haeckel includes |
A. | bacteria |
B. | algae |
C. | fungi |
D. | all of these |
Answer» E. | |
76. |
Prokaryotic microorganism include |
A. | protozoa |
B. | fungi |
C. | bacteria |
D. | all of these |
Answer» D. all of these | |
77. |
The three domain version of life on earth is based on the |
A. | nucleic acid sequence data |
B. | morphological traits |
C. | metabolic traits |
D. | characteristics of the cell wall |
Answer» B. morphological traits | |
78. |
The foundation for the germ theory of disease was set down by |
A. | Robert Koch |
B. | Ronald Ross |
C. | Louis Pasteur |
D. | Walter Reed |
Answer» D. Walter Reed | |
79. |
The idea of selective toxicity was first proposed by |
A. | Antony van Leeuwenhoek |
B. | Paul Ehrlich |
C. | Louis Pasteur |
D. | Alexander Fleming |
Answer» C. Louis Pasteur | |
80. |
Archeal cells usually do not contain peptidoglycan, rather contain pseudo-peptidoglycan which is mainly composed of |
A. | N-acetylmuramic acid and L-amino acids |
B. | N-acetylmuramic acid and D-amino acids |
C. | N-acetyltalosaminuronic acid and D-amino acids |
D. | N-acetyltalosaminuronic acid and L-amino acids |
Answer» E. | |
81. |
The five-kingdom system of classification was set up by |
A. | Louis Pasteur |
B. | Robert Whittaker |
C. | Robert Koch |
D. | Masaki Ogata |
Answer» C. Robert Koch | |
82. |
Primary differences between cilia and flagella are |
A. | arrangement of microtubules |
B. | length and location of basal bodies |
C. | how the microtubules are fused to each other |
D. | number, length and direction of force |
Answer» E. | |
83. |
Micro organisms are found in which of the following kingdom of five kingdom concept (Whittaker's classification)? |
A. | Monera |
B. | Protista |
C. | Fungi |
D. | All of these |
Answer» E. | |
84. |
Which of the following is/are included in Kingdom Prokaryotae? |
A. | Bacteria |
B. | Protozoa |
C. | Fungi |
D. | All of these |
Answer» B. Protozoa | |
85. |
Which of the following may account for the small size of the cells? |
A. | The rate of diffusion |
B. | The surface area/volume ratio |
C. | The number of mRNAs that can be produced by the nucleus |
D. | All of the above |
Answer» E. | |
86. |
The membranes of which domains are chemically the most similar? |
A. | Archaea and Bacteria |
B. | Bacteria and Eukarya |
C. | Eukarya and Archaea |
D. | membranes of all three domains are chemically identical |
Answer» C. Eukarya and Archaea | |
87. |
All membranes of free-living organisms have phospholipid bilayers, but exception is |
A. | bacteria |
B. | fungi |
C. | archaea |
D. | protozoa |
Answer» D. protozoa | |
88. |
All of the following are features of prokaryotes except |
A. | nitrogen fixation |
B. | photosynthesis |
C. | sexual reproduction |
D. | locomotion |
Answer» D. locomotion | |
89. |
Which of the following structure is absent in eukaryotic cells? |
A. | Mitochondria |
B. | Chloroplasts |
C. | Golgi structure |
D. | Mesosome |
Answer» E. | |
90. |
Which one is not studied in microbiology? |
A. | Bacteria |
B. | Animal behaviour |
C. | Fungi |
D. | Algae |
Answer» C. Fungi | |
91. |
A newly discovered microscopic structure is hypothesized to be a living organism. Which of the following lines of evidence would support the contention that this organism may be alive? |
A. | It contains DNA |
B. | It is made of a single cell |
C. | It utilizes energy |
D. | All of these |
Answer» D. All of these | |
92. |
Mycoplasmas, rickettsiae, and chlamydiae are |
A. | types of fungi |
B. | small bacteria |
C. | species of protozoa |
D. | forms of viruses |
Answer» C. species of protozoa | |
93. |
Mycoplasmas are different from the other prokaryotes by |
A. | presence of chitin in cell walls |
B. | presence of murrain in cell walls |
C. | presence of proteins in cell walls |
D. | absence of cell wall itself |
Answer» E. | |
94. |
Evolutionary relationships between groups of organisms are determined using which of the following type of information? |
A. | Comparisons of nucleotide sequences |
B. | Comparisons of biochemical pathways |
C. | Comparisons of structural features |
D. | All of the above |
Answer» E. | |
95. |
Which of the following is not true for eukaryotic cells? |
A. | Nucleus is bounded by nuclear membrane |
B. | Chromosomes contain histones |
C. | Chloroplasts and mitochondria contains 70S ribosomes |
D. | Gas vacuoles are present |
Answer» E. | |
96. |
Gram staining was introduced by |
A. | Christian gram |
B. | Alfred Gram |
C. | Robertcook |
D. | Louis Pasteur |
Answer» B. Alfred Gram | |
97. |
Which of the following best represents the hierarchy of levels of biological classification? |
A. | Phylum, kingdom, class, order, genus, species, family |
B. | Kingdom, phylum, class, order, family, genus, species |
C. | Kingdom, phylum, family, class, order, genus, species |
D. | Class, order, kingdom, phylum, family, genus, species |
Answer» C. Kingdom, phylum, family, class, order, genus, species | |
98. |
What are Blue-Green bacteria called? |
A. | <i>Acquaobacteria</i> |
B. | <i>Cyanobacteria</i> |
C. | <i>Protozoa</i> |
D. | None of the above |
Answer» C. <i>Protozoa</i> | |
99. |
The endosymbiosis hypothesis provides an explanation for how |
A. | eukaryotes developed from prokayotes |
B. | prokaryotes developed from eukaryotes |
C. | algae developed from protozoa |
D. | protozoa developed from algae |
Answer» B. prokaryotes developed from eukaryotes | |
100. |
Which cell type is considered to have the oldest ancestor? |
A. | <i>Archaea</i> |
B. | <i>Bacteria</i> |
C. | <i> Eukarya</i> |
D. | they all share the same ancestor |
Answer» E. | |