Explore topic-wise MCQs in Microbiology.

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.