BIOL180 Lesson 8 Quiz – Microbiology
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1. Which of the following best describes microbiology?
A. The study of large multicellular organisms
B. The study of microorganisms and their interactions with living and
nonliving environments
C. The study of Earth's atmosphere
D. The study of fossils only
Answer: B
Rationale: Microbiology is the branch of biology that studies microscopic
organisms, including bacteria, viruses, fungi, protozoa, and microscopic
algae, as well as their structure, function, genetics, and ecological roles.
2. Which of the following organisms is classified as a prokaryote?
A. Amoeba
B. Bacterium
C. Mushroom
D. Yeast
,Rationale: Bacteria are prokaryotic organisms because they lack a
membrane-bound nucleus and membrane-bound organelles.
3. Which cellular structure is absent in prokaryotic cells?
A. Plasma membrane
B. Cytoplasm
C. Membrane-bound nucleus
D. Ribosomes
Rationale: Prokaryotes possess ribosomes, cytoplasm, and plasma
membranes but do not have a membrane-bound nucleus.
4. Which kingdom contains most bacteria?
A. Animalia
B. Plantae
C. Bacteria (Eubacteria)
D. Fungi
Rationale: Members of the kingdom Bacteria, also called Eubacteria, are
the most common prokaryotic microorganisms found in diverse
environments.
5. What is the primary function of bacterial ribosomes?
A. DNA replication
B. Cell movement
C. Protein synthesis
D. Lipid digestion
Rationale: Ribosomes translate messenger RNA into proteins, making them
the sites of protein synthesis.
6. Which microorganism is an obligate intracellular parasite?
A. Bacterium
B. Virus
, C. Fungus
D. Protozoan
Rationale: Viruses require living host cells to reproduce because they lack
the machinery needed for independent metabolism and replication.
7. Which structure protects many bacteria from drying and immune
attack?
A. Flagellum
B. Ribosome
C. Pili
D. Capsule
Rationale: The bacterial capsule provides protection against desiccation
and helps bacteria evade host immune defenses.
8. The process by which bacteria reproduce most commonly is:
A. Mitosis
B. Binary fission
C. Meiosis
D. Budding
Rationale: Binary fission is an asexual reproductive process that produces
two genetically identical bacterial cells.
9. Which bacterial shape is spherical?
A. Coccus
B. Bacillus
C. Spirillum
D. Vibrio
Rationale: Cocci are spherical bacteria, whereas bacilli are rod-shaped and
spirilla are spiral-shaped.
Basics Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which of the following best describes microbiology?
A. The study of large multicellular organisms
B. The study of microorganisms and their interactions with living and
nonliving environments
C. The study of Earth's atmosphere
D. The study of fossils only
Answer: B
Rationale: Microbiology is the branch of biology that studies microscopic
organisms, including bacteria, viruses, fungi, protozoa, and microscopic
algae, as well as their structure, function, genetics, and ecological roles.
2. Which of the following organisms is classified as a prokaryote?
A. Amoeba
B. Bacterium
C. Mushroom
D. Yeast
,Rationale: Bacteria are prokaryotic organisms because they lack a
membrane-bound nucleus and membrane-bound organelles.
3. Which cellular structure is absent in prokaryotic cells?
A. Plasma membrane
B. Cytoplasm
C. Membrane-bound nucleus
D. Ribosomes
Rationale: Prokaryotes possess ribosomes, cytoplasm, and plasma
membranes but do not have a membrane-bound nucleus.
4. Which kingdom contains most bacteria?
A. Animalia
B. Plantae
C. Bacteria (Eubacteria)
D. Fungi
Rationale: Members of the kingdom Bacteria, also called Eubacteria, are
the most common prokaryotic microorganisms found in diverse
environments.
5. What is the primary function of bacterial ribosomes?
A. DNA replication
B. Cell movement
C. Protein synthesis
D. Lipid digestion
Rationale: Ribosomes translate messenger RNA into proteins, making them
the sites of protein synthesis.
6. Which microorganism is an obligate intracellular parasite?
A. Bacterium
B. Virus
, C. Fungus
D. Protozoan
Rationale: Viruses require living host cells to reproduce because they lack
the machinery needed for independent metabolism and replication.
7. Which structure protects many bacteria from drying and immune
attack?
A. Flagellum
B. Ribosome
C. Pili
D. Capsule
Rationale: The bacterial capsule provides protection against desiccation
and helps bacteria evade host immune defenses.
8. The process by which bacteria reproduce most commonly is:
A. Mitosis
B. Binary fission
C. Meiosis
D. Budding
Rationale: Binary fission is an asexual reproductive process that produces
two genetically identical bacterial cells.
9. Which bacterial shape is spherical?
A. Coccus
B. Bacillus
C. Spirillum
D. Vibrio
Rationale: Cocci are spherical bacteria, whereas bacilli are rod-shaped and
spirilla are spiral-shaped.
