Microbiology MCQ & Objective Questions
Microbiology is a crucial subject for students preparing for school and competitive exams in India. Understanding microorganisms and their roles in various processes is essential for scoring well. Practicing MCQs and objective questions in Microbiology not only enhances your knowledge but also boosts your confidence, making you better prepared for exams. Engaging with practice questions helps identify important concepts and improves your ability to tackle exam challenges effectively.
What You Will Practise Here
Fundamental concepts of microbiology, including the classification of microorganisms.
Key definitions and terminologies related to bacteria, viruses, fungi, and protozoa.
Important Microbiology MCQ questions covering microbial metabolism and growth.
Diagrams illustrating the structure of various microorganisms.
Pathogenic microorganisms and their impact on human health.
Techniques used in microbiological research and laboratory practices.
Applications of microbiology in medicine, agriculture, and industry.
Exam Relevance
Microbiology is a significant topic in various examinations such as CBSE, State Boards, NEET, and JEE. Questions often focus on the characteristics of microorganisms, their classification, and their roles in health and disease. Common question patterns include multiple-choice questions that test conceptual understanding and application of knowledge in real-world scenarios. Students can expect to encounter both theoretical questions and practical applications in their exams.
Common Mistakes Students Make
Confusing the characteristics of different types of microorganisms, such as bacteria and viruses.
Overlooking the importance of diagrams and their labels in understanding microbial structures.
Misunderstanding the processes of microbial metabolism and growth conditions.
Failing to connect microbiological concepts with their applications in health and disease.
Neglecting to review past exam papers for common question formats and topics.
FAQs
Question: What are the key topics I should focus on in Microbiology for my exams?Answer: Focus on the classification of microorganisms, their metabolic processes, and their roles in health and disease.
Question: How can I improve my performance in Microbiology MCQs?Answer: Regular practice of MCQs, understanding key concepts, and reviewing mistakes will enhance your performance.
Start solving practice MCQs today to strengthen your understanding of Microbiology and excel in your exams. Your success is just a question away!
Q. Which of the following is NOT a symptom of foodborne illness?
A.
Vomiting
B.
Fever
C.
Rash
D.
Abdominal cramps
Show solution
Solution
A rash is not a typical symptom of foodborne illness.
Correct Answer:
C
— Rash
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Q. Which of the following is NOT a terminal electron acceptor in anaerobic respiration?
A.
Sulfate
B.
Nitrate
C.
Oxygen
D.
Carbon dioxide
Show solution
Solution
Oxygen is not used as a terminal electron acceptor in anaerobic respiration.
Correct Answer:
C
— Oxygen
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Q. Which of the following is NOT a type of toxin produced by Clostridium perfringens?
A.
Alpha toxin
B.
Beta toxin
C.
Epsilon toxin
D.
Gamma toxin
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Solution
Clostridium perfringens produces alpha, beta, and epsilon toxins, but not gamma toxin.
Correct Answer:
D
— Gamma toxin
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Q. Which of the following is required to initiate DNA replication?
A.
RNA primer
B.
DNA ligase
C.
DNA helicase
D.
DNA polymerase
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Solution
An RNA primer is required to provide a starting point for DNA polymerase to begin synthesis.
Correct Answer:
A
— RNA primer
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Q. Which of the following protozoa is known to cause malaria?
A.
Entamoeba histolytica
B.
Plasmodium falciparum
C.
Trypanosoma brucei
D.
Toxoplasma gondii
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Solution
Plasmodium falciparum is the protozoan responsible for the most severe form of malaria.
Correct Answer:
B
— Plasmodium falciparum
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Q. Which of the following statements about DNA replication is true?
A.
It is a conservative process
B.
It is a semi-conservative process
C.
It is a dispersive process
D.
It occurs only in prokaryotes
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Solution
DNA replication is a semi-conservative process, meaning each new DNA molecule consists of one old strand and one new strand.
Correct Answer:
B
— It is a semi-conservative process
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Q. Which of the following statements about enzyme inhibitors is true?
A.
They always permanently inactivate enzymes.
B.
They can be reversible or irreversible.
C.
They only affect allosteric enzymes.
D.
They increase the rate of reaction.
Show solution
Solution
Enzyme inhibitors can be either reversible or irreversible, affecting enzyme activity in different ways.
Correct Answer:
B
— They can be reversible or irreversible.
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Q. Which of the following treatments is commonly used for HIV infection?
A.
Antibiotics
B.
Antiretroviral therapy
C.
Vaccines
D.
Corticosteroids
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Solution
Antiretroviral therapy (ART) is the standard treatment for HIV infection.
Correct Answer:
B
— Antiretroviral therapy
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Q. Which of the following viruses is known for causing severe acute respiratory syndrome (SARS)?
A.
Influenza virus
B.
SARS-CoV
C.
MERS-CoV
D.
Hantavirus
Show solution
Solution
SARS is caused by the SARS coronavirus (SARS-CoV).
Correct Answer:
B
— SARS-CoV
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Q. Which of the following viruses is known for causing severe respiratory illness?
A.
Ebola virus
B.
SARS-CoV-2
C.
Zika virus
D.
Herpes simplex virus
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Solution
SARS-CoV-2 is known for causing severe respiratory illness, particularly COVID-19.
Correct Answer:
B
— SARS-CoV-2
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Q. Which of the following viruses is known to cause severe acute respiratory syndrome (SARS)?
A.
HIV
B.
SARS-CoV
C.
Influenza virus
D.
Ebola virus
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Solution
SARS is caused by the SARS coronavirus (SARS-CoV), which emerged in the early 2000s.
Correct Answer:
B
— SARS-CoV
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Q. Which of the following viruses is known to cause the common cold?
A.
HIV
B.
Rhinovirus
C.
Hepatitis B
D.
Ebola
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Solution
Rhinovirus is the most common viral agent responsible for the common cold.
Correct Answer:
B
— Rhinovirus
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Q. Which organelle is primarily responsible for ATP production?
A.
Nucleus
B.
Ribosome
C.
Mitochondrion
D.
Endoplasmic reticulum
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Solution
Mitochondria are the organelles responsible for ATP production through cellular respiration.
Correct Answer:
C
— Mitochondrion
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Q. Which phase of the cell cycle does DNA replication occur?
A.
G1 phase
B.
S phase
C.
G2 phase
D.
M phase
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Solution
DNA replication occurs during the S phase of the cell cycle.
Correct Answer:
B
— S phase
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Q. Which physical agent is used in radiation therapy to target cancer cells?
A.
Ultrasound
B.
X-rays
C.
Microwaves
D.
Infrared radiation
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Solution
X-rays are commonly used in radiation therapy to target and destroy cancer cells.
Correct Answer:
B
— X-rays
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Q. Which population is at highest risk for severe disease caused by Streptococcus pneumoniae?
A.
Healthy adults
B.
Children under 5
C.
Elderly individuals
D.
Pregnant women
Show solution
Solution
Elderly individuals are at the highest risk for severe disease caused by Streptococcus pneumoniae.
Correct Answer:
C
— Elderly individuals
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Q. Which process converts glucose into ATP in the presence of oxygen?
A.
Fermentation
B.
Glycolysis
C.
Aerobic respiration
D.
Anaerobic respiration
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Solution
Aerobic respiration is the process that converts glucose into ATP using oxygen.
Correct Answer:
C
— Aerobic respiration
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Q. Which process do microbes use to produce vinegar?
A.
Anaerobic respiration
B.
Aerobic respiration
C.
Fermentation
D.
Photosynthesis
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Solution
Aerobic respiration is used by acetic acid bacteria to convert ethanol into acetic acid, producing vinegar.
Correct Answer:
B
— Aerobic respiration
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Q. Which process involves the transfer of genetic material between bacteria through direct contact?
A.
Transformation
B.
Transduction
C.
Conjugation
D.
Replication
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Solution
Conjugation is the process where genetic material is transferred between bacteria through direct contact, typically via a pilus.
Correct Answer:
C
— Conjugation
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Q. Which process involves the uptake of naked DNA by a bacterial cell?
A.
Transduction
B.
Conjugation
C.
Transformation
D.
Binary fission
Show solution
Solution
Transformation is the process where bacteria take up naked DNA from their environment.
Correct Answer:
C
— Transformation
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Q. Which process is primarily carried out by soil microorganisms?
A.
Photosynthesis
B.
Nitrification
C.
Transpiration
D.
Evaporation
Show solution
Solution
Nitrification is a key process carried out by soil microorganisms, converting ammonia to nitrates.
Correct Answer:
B
— Nitrification
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Q. Which process is primarily used to remove suspended solids from wastewater?
A.
Sedimentation
B.
Filtration
C.
Chlorination
D.
Aeration
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Solution
Sedimentation is primarily used to remove suspended solids from wastewater by allowing them to settle at the bottom of a tank.
Correct Answer:
A
— Sedimentation
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Q. Which process occurs first during the initiation of translation?
A.
Binding of the ribosome to mRNA
B.
tRNA binding to the start codon
C.
Formation of the peptide bond
D.
Release of the completed polypeptide
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Solution
The binding of the ribosome to mRNA occurs first during the initiation of translation.
Correct Answer:
A
— Binding of the ribosome to mRNA
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Q. Which process occurs in the absence of oxygen and produces lactic acid?
A.
Aerobic respiration
B.
Glycolysis
C.
Lactic acid fermentation
D.
Krebs cycle
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Solution
Lactic acid fermentation occurs in the absence of oxygen and produces lactic acid.
Correct Answer:
C
— Lactic acid fermentation
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Q. Which protozoan is commonly associated with sleeping sickness?
A.
Giardia lamblia
B.
Plasmodium vivax
C.
Trypanosoma brucei
D.
Leishmania donovani
Show solution
Solution
Trypanosoma brucei is the causative agent of sleeping sickness, transmitted by tsetse flies.
Correct Answer:
C
— Trypanosoma brucei
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Q. Which protozoan is known to cause severe dehydration in children due to diarrhea?
A.
Cryptosporidium parvum
B.
Entamoeba histolytica
C.
Giardia lamblia
D.
Balantidium coli
Show solution
Solution
Cryptosporidium parvum can cause severe diarrhea leading to dehydration, especially in children.
Correct Answer:
A
— Cryptosporidium parvum
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Q. Which RNA molecule carries the genetic information from DNA to the ribosome?
A.
tRNA
B.
rRNA
C.
mRNA
D.
snRNA
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Solution
mRNA (messenger RNA) carries the genetic information from DNA to the ribosome for protein synthesis.
Correct Answer:
C
— mRNA
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Q. Which seafood is considered a good source of protein and low in calories?
A.
Shrimp
B.
Crab
C.
Lobster
D.
All of the above
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Solution
All of these seafood options are high in protein and low in calories, making them healthy choices.
Correct Answer:
D
— All of the above
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Q. Which seafood is known for its high levels of astaxanthin, a powerful antioxidant?
A.
Salmon
B.
Tuna
C.
Tilapia
D.
Cod
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Solution
Salmon is known for its high levels of astaxanthin, which contributes to its pink color and antioxidant properties.
Correct Answer:
A
— Salmon
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Q. Which sequencing method uses fluorescently labeled nucleotides?
A.
Sanger sequencing
B.
Next-generation sequencing
C.
Pyrosequencing
D.
Capillary electrophoresis
Show solution
Solution
Next-generation sequencing utilizes fluorescently labeled nucleotides to determine DNA sequences.
Correct Answer:
B
— Next-generation sequencing
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