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Microbiology Multiple Choice Questions | MCQs | Quiz

Microbiology Interview Questions and Answers
Practice Microbiology questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Microorganisms
•   Microbial Classification
•   Light Microscope
•   Scanning Microscope
•   Microbial Stains
•   Bacterial Cells Size
•   ↓ Cell Wall ↓
•   External Structures
•   The Cell Wall
•   Internal Structures
•   Nutritional Requirements
•   Bacteriological Media
•   Physical Conditions
•   Cell Division Modes
•   Bacteria Growth Cycle
•   Bacterial Growth
•   Selective Methods
•   Pure Cultures
•   Cultural Characteristics
•   Bioenergetics Principles
•   ↓ Energy Production ↓
•   Anaerobic Processes
•   Aerobic Processes
•   Photosynthesis
•   ↓ Energy Utilization ↓
•   Nonbiosynthetic Processes
•   Biosynthetic Processes
•   Deoxyribonucleic Acid
•   Genetic Information
•   Protein Synthesis Process
•   Spirochetes
•   Negative Rods & Cocci
•   Facultatively Anaerobic
•   Curved & Helical Rods
•   Rickettsias & Chlamydias
•   Mycoplasmas
•   Gram - Positive Cocci
•   Positive Bacteria
•   Nonspore - Forming Gram
•   Morphology
•   Reproduction
•   Fungi Cultivation
•   Fungi Classification
•   Fungi - Special Interest
•   Algae Economic Importance
•   Algae Characteristics
•   Algae Classification
•   Protozoa Ecology
•   Protozoa Morphology
•   Protozoa Reproduction
•   Protozoa Characteristics
•   Phages Structure
•   Bacterial Virus Replication
•   Lysogeny & Lytic
•   Viruses & Vaccination
•   Structure & Composition
•   Viruses Classification
•   Virus Infection - Animals
•   Control Fundamentals
•   Physical Agents
•   Chemical Agents Definition
•   Antimicrobial Agent Groups
•   Antimicrobial Chemical
•   Chemotherapy Highlights
•   Antibiotics & their Actions
•   Antitumour Antibiotics
•   Soil Microorganisms
•   Nitrogen Cycle
•   Carbon & Sulphur Cycle
•   Aquatic Environment
•   ↓ Aquatic Microorganisms ↓
•   Distribution & Techniques
•   Aquatic Microorganisms
•   Productivity
•   Water - Sanitary Quality
•   Wastewater
•   Fresh Foods Flora
•   Foods Preservation
•   Microorganisms as Food
•   Microorganisms & Industry
•   Bacteria Industrial Uses
•   Yeasts Industrial Uses
•   Molds Industrial Uses
•   Genotypic Changes
•   Bacterial Recombination
•   Bacterial Conjugation
•   Bacterial Transduction
•   Bacterial Transformation
•   Normal Flora & Human Host
•   Normal Flora Distribution
•   Microbial Adherence
•   Epithelial Cell Layers
•   Infection Events
•   Microbial Virulence Factors
•   ↓ Diseases Caused ↓
•   Aerobic & Anaerobic Gram
•   Streptococcus & Bacillus
•   Corynebacterium
•   Single - Stranded RNA
•   Double - Stranded DNA
•   Diseases Caused - Fungi
•   Diseases - Protozoa
•   Therapeutic Drugs

Best Reference Books

Microbiology Books
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Microbiology Questions and Answers – Major Characteristics of Microorganisms

Posted on June 8, 2018 by Manish

This set of Microbiology Multiple Choice Questions & Answers (MCQs) focuses on “Major Characteristics of Microorganisms”.

1. For the examination of microbial cells we require the use of?
a) High-power microscope
b) Low-power microscope
c) High-power microscope at a magnification of about 1,000 diameters
d) Low-power microscope at a magnification of about 1,000 diameters
View Answer

Answer: c
Explanation: Microorganisms are very small and their size is usually expressed in micrometers. So for routine examination of microbial cells we require the use of a high-power microscope, usually at a magnification of about 1,000 diameters.
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2. Lipopolysaccharide in cell walls is characteristic of?
a) Gram-positive bacteria
b) Gram-negative bacteria
c) Fungi
d) Algae
View Answer

Answer: b
Explanation: The occurrence of lipopolysaccharide in cell walls is characteristic of Gram-negative bacteria; whereas Gram-positive bacteria have cell walls that contain teichoic acid. Fungal and algal cell walls are very different in composition from those of bacteria.

3. Which microorganism(s) among the following perform photosynthesis by utilizing light?
a) Cyanobacteria
b) Fungi
c) Viruses
d) Cyanobacteria, Fungi and Viruses
View Answer

Answer: a
Explanation: Cyanobacteria require light as a source of energy to perform photosynthesis. Fungi and viruses are unable to perform photosynthesis and are heterotrophic.

4. Growth of microbes in a solid media is identified by the formation of?
a) pellicle at the top of media
b) colonies
c) sediment at the bottom
d) turbidity
View Answer

Answer: b
Explanation: On solid media, microbes grow as colonies – distinct, compact masses of cells that are macroscopically visible. When microbes grow in a liquid media, the media becomes turbid and growth may either occur only as sediment at the bottom or only as a thin film or pellicle at the top.

5. Which among the following are produced by microorganisms?
a) Fermented dairy products
b) Breads
c) Alcoholic beverages
d) Fermented dairy products, breads and alcoholic beverages
View Answer

Answer: d
Explanation: Microorganisms are used in many industries for the production of food we eat, like fermented dairy products (sour cream, yogurt), as well as fermented foods as pickles, breads and alcoholic beverages.
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6. What are the blood serum proteins produced by animals called?
a) Enzymes
b) Antibodies
c) Amino acids
d) Toxins
View Answer

Answer: b
Explanation: Certain chemical compounds of microbial cells are called antigens. If microbial cells enter the animal body, the animal responds to these antigens by forming specific blood serum proteins called antibodies, which bind to the antigens.

7. The DNA molecule of microorganisms is made up of base pairs of ________________
a) guanine-cytosine
b) adenine-thymine
c) adenine-cytosine
d) guanine-cytosine and adenine-thymine
View Answer

Answer: d
Explanation: The DNA molecule has a base composition of the following sequence as base pairs; guanine-cytosine and adenine-thymine. The ratio of A:T= the ratio of G:C.

8. The DNA of Klebsiella pneumonia has a moles % G+C content of?
a) 70-71
b) 50-53
c) 56-58
d) 32-35
View Answer

Answer: c
Explanation: The sequence of nucleotide bases in the DNA is unique for each kind of microorganism.

Species Moles % G+C content of DNA
Klebsiella pneumonia 56-58
Azospirillum brasilense 70-71
Campylobacter fetus 32-35
Neisseria gonorrhoeae 50-53

9. Plamids are circular DNA molecules capable of autonomous replication.
a) True
b) False
View Answer

Answer: a
Explanation: In addition to chromosomal DNA, plasmid DNA may sometimes be present in microbial cells. Plasmids are circular DNA molecules that are capable of autonomous replication within bacterial cells that contain them and their presence can confer special characteristics on the cells that contain them.
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10. Bdellovibrios come under which group of microorganisms?
a) Viruses
b) Bacteria
c) Fungi
d) Algae
View Answer

Answer: b
Explanation: Bdellovibrios are bacteria which are predatory on other bacteria. They have the ability to cause diseases or are pathogenic for other microorganisms.

Sanfoundry Global Education & Learning Series – Microbiology.

To practice all areas of Microbiology, here is complete set of 1000+ Multiple Choice Questions and Answers.

» Next Page - Microbiology Questions and Answers – Microbial Classification

« Statistical Quality Control Questions and Answers – Military Standard 105E
Microbiology Questions and Answers – Microbial Classification »
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Deep Dive @ Sanfoundry:

  1. Dairy Engineering Questions and Answers
  2. Applied Chemistry Questions and Answers
  3. Molecular Biology Questions and Answers
  4. Bioprocess Engineering Questions and Answers
  5. Microbiology Questions and Answers – Physiology and Cultivation of Fungi
  6. Microbiology Questions and Answers – The Mycoplasmas
  7. Microbiology Questions and Answers – Characteristics of Some Major Groups of Protozoa
  8. Microbiology Questions and Answers – Microorganisms and Industry
  9. Microbiology Questions and Answers – Major Groups of Antimicrobial Agents
  10. Microbiology Questions and Answers – Interactions among Soil Microorganisms
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below:
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