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BIOD 171 ESSENTIAL MICROBIOLOGY — MODULES 1–6 EXAM
COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS LATEST EDITION
2026
BIOD 171 ESSENTIAL MICROBIOLOGY — MODULES 1–6 EXAM & FINAL EXAM
10-POINT EXAM COVERAGE SUMMARY
1. Foundations of Microbiology – History, spontaneous generation, cell theory, taxonomy,
microscopy
2. Macromolecules & Cell Structure – Proteins, nucleic acids, lipids, carbohydrates,
prokaryotic vs. eukaryotic cells
3. Microbial Metabolism – Enzymes, catabolism, anabolism, ATP, redox reactions,
glycolysis, fermentation
4. Microscopy & Staining – Resolution, contrast, simple/Gram/Ziehl-Neelsen stains, phase-
contrast, fluorescence, TEM/SEM
5. Microbial Growth & Culture Media – Selective, differential, enriched media, agar,
growth phases, oxygen requirements
6. Pathogenic Microbes & Infection – Universal precautions, PPE, virulence factors,
exotoxins, endotoxins, opportunistic pathogens
7. Virology – Viral structure, capsid, envelope, lytic/lysogenic cycles, retroviruses, viral
diseases
8. Genetics & Gene Expression – DNA replication, transcription, translation, mutations,
horizontal gene transfer
9. Immunology – Innate vs. adaptive immunity, antibodies, vaccines, hypersensitivity
10. Final Exam Integration – Comprehensive synthesis of Modules 1–6 concepts
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SECTION 1: FOUNDATIONS OF MICROBIOLOGY (MODULE 1 – PART A) (30 QUESTIONS)
1. Which of the following best describes the primary focus of clinical microbiology?
A) The study of microorganisms in soil and water
B) The study of microbes that cause disease
C) The study of the genetic makeup of viruses
D) The study of microbial metabolism in extreme environments
Rationale: Clinical microbiology specifically focuses on pathogens—microorganisms that cause
disease in humans.
2. What is the smallest biological unit of life?
A) The molecule
B) The atom
C) The cell
D) The tissue
Rationale: The cell is the basic structural and functional unit of all living organisms; molecules
and atoms are not alive.
3. At a generalized level, all cells are comprised of what?
A) Organelles
B) Macromolecules
C) Tissues
D) Nuclei
Rationale: Cells are constructed primarily from four classes of macromolecules—proteins, lipids,
nucleic acids, and polysaccharides.
4. Which of the following are the four main types of macromolecules found in cells?
A) Proteins, Lipids, Nucleic acids, Polysaccharides
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B) Proteins, Fats, DNA, RNA
C) Enzymes, Hormones, Carbohydrates, Lipids
D) Amino acids, Sugars, Nucleotides, Fatty acids
Rationale: The four fundamental classes of biomolecules are proteins, lipids, nucleic acids, and
polysaccharides (carbohydrates).
5. How many different types of amino acids are available from which to make proteins?
A) 9
B) 12
C) 20
D) 64
Rationale: There are 20 standard amino acids that serve as the building blocks for all proteins in
living organisms.
6. How many amino acids are classified as essential amino acids?
A) 20
B) 9
C) 12
D) 6
Rationale: Essential amino acids cannot be produced by the human body and must be obtained
through diet; there are 9 essential amino acids.
7. Where can the two major types of nucleic acids be found in the cell, and what are their
respective roles?
A) Both are found in the nucleus; DNA synthesizes proteins while RNA stores genetic
information
B) DNA is in the nucleus and mitochondria; RNA is in the nucleus, cytoplasm, and ribosomes;
DNA stores hereditary information and RNA synthesizes proteins
C) Both are found in the cytoplasm; DNA directs protein synthesis while RNA carries genetic
material
D) DNA is in the ribosomes; RNA is in the nucleus; both store genetic information
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Rationale: DNA stores hereditary information in the nucleus and mitochondria, while RNA is
found throughout the cell and is involved in protein synthesis.
8. What is the plasma membrane, and what is it made up of?
A) A rigid outer layer made of cellulose
B) A surrounding barrier that separates the inside of the cell from the outside environment,
composed of lipids
C) A protein coat that surrounds the nucleus
D) A carbohydrate layer that provides energy
Rationale: The plasma membrane serves as a barrier that separates the cell from its
environment and restricts movement of materials; it is composed of lipids.
9. What are the three main components of carbohydrates?
A) Carbon, hydrogen, and oxygen
B) Carbon, nitrogen, and oxygen
C) Hydrogen, oxygen, and nitrogen
D) Carbon, hydrogen, and phosphorus
Rationale: Carbohydrates are composed of carbon, hydrogen, and oxygen atoms. Examples
include glucose (C₆H₁₂O₆) and sucrose (C₁₂H₂₂O₁₁).
10. What is the primary difference between prokaryotic and eukaryotic cells?
A) Prokaryotic cells are larger than eukaryotic cells
B) Eukaryotic cells contain a nucleus, while prokaryotic cells do not
C) Prokaryotic cells have membrane-bound organelles, while eukaryotic cells do not
D) Eukaryotic cells are always unicellular
Rationale: Eukaryotic cells contain a membrane-enclosed nucleus, while prokaryotic cells lack a
nucleus and are classified as Bacteria or Archaea.
11. What are the main morphologies of bacteria?
A) Coccus, bacillus, vibrio, spirillum
B) Round, square, triangular, oval
C) Spherical, filamentous, branching, budding
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BIOD 171 ESSENTIAL MICROBIOLOGY — MODULES 1–6 EXAM
COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS LATEST EDITION
2026
BIOD 171 ESSENTIAL MICROBIOLOGY — MODULES 1–6 EXAM & FINAL EXAM
10-POINT EXAM COVERAGE SUMMARY
1. Foundations of Microbiology – History, spontaneous generation, cell theory, taxonomy,
microscopy
2. Macromolecules & Cell Structure – Proteins, nucleic acids, lipids, carbohydrates,
prokaryotic vs. eukaryotic cells
3. Microbial Metabolism – Enzymes, catabolism, anabolism, ATP, redox reactions,
glycolysis, fermentation
4. Microscopy & Staining – Resolution, contrast, simple/Gram/Ziehl-Neelsen stains, phase-
contrast, fluorescence, TEM/SEM
5. Microbial Growth & Culture Media – Selective, differential, enriched media, agar,
growth phases, oxygen requirements
6. Pathogenic Microbes & Infection – Universal precautions, PPE, virulence factors,
exotoxins, endotoxins, opportunistic pathogens
7. Virology – Viral structure, capsid, envelope, lytic/lysogenic cycles, retroviruses, viral
diseases
8. Genetics & Gene Expression – DNA replication, transcription, translation, mutations,
horizontal gene transfer
9. Immunology – Innate vs. adaptive immunity, antibodies, vaccines, hypersensitivity
10. Final Exam Integration – Comprehensive synthesis of Modules 1–6 concepts
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SECTION 1: FOUNDATIONS OF MICROBIOLOGY (MODULE 1 – PART A) (30 QUESTIONS)
1. Which of the following best describes the primary focus of clinical microbiology?
A) The study of microorganisms in soil and water
B) The study of microbes that cause disease
C) The study of the genetic makeup of viruses
D) The study of microbial metabolism in extreme environments
Rationale: Clinical microbiology specifically focuses on pathogens—microorganisms that cause
disease in humans.
2. What is the smallest biological unit of life?
A) The molecule
B) The atom
C) The cell
D) The tissue
Rationale: The cell is the basic structural and functional unit of all living organisms; molecules
and atoms are not alive.
3. At a generalized level, all cells are comprised of what?
A) Organelles
B) Macromolecules
C) Tissues
D) Nuclei
Rationale: Cells are constructed primarily from four classes of macromolecules—proteins, lipids,
nucleic acids, and polysaccharides.
4. Which of the following are the four main types of macromolecules found in cells?
A) Proteins, Lipids, Nucleic acids, Polysaccharides
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B) Proteins, Fats, DNA, RNA
C) Enzymes, Hormones, Carbohydrates, Lipids
D) Amino acids, Sugars, Nucleotides, Fatty acids
Rationale: The four fundamental classes of biomolecules are proteins, lipids, nucleic acids, and
polysaccharides (carbohydrates).
5. How many different types of amino acids are available from which to make proteins?
A) 9
B) 12
C) 20
D) 64
Rationale: There are 20 standard amino acids that serve as the building blocks for all proteins in
living organisms.
6. How many amino acids are classified as essential amino acids?
A) 20
B) 9
C) 12
D) 6
Rationale: Essential amino acids cannot be produced by the human body and must be obtained
through diet; there are 9 essential amino acids.
7. Where can the two major types of nucleic acids be found in the cell, and what are their
respective roles?
A) Both are found in the nucleus; DNA synthesizes proteins while RNA stores genetic
information
B) DNA is in the nucleus and mitochondria; RNA is in the nucleus, cytoplasm, and ribosomes;
DNA stores hereditary information and RNA synthesizes proteins
C) Both are found in the cytoplasm; DNA directs protein synthesis while RNA carries genetic
material
D) DNA is in the ribosomes; RNA is in the nucleus; both store genetic information
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Rationale: DNA stores hereditary information in the nucleus and mitochondria, while RNA is
found throughout the cell and is involved in protein synthesis.
8. What is the plasma membrane, and what is it made up of?
A) A rigid outer layer made of cellulose
B) A surrounding barrier that separates the inside of the cell from the outside environment,
composed of lipids
C) A protein coat that surrounds the nucleus
D) A carbohydrate layer that provides energy
Rationale: The plasma membrane serves as a barrier that separates the cell from its
environment and restricts movement of materials; it is composed of lipids.
9. What are the three main components of carbohydrates?
A) Carbon, hydrogen, and oxygen
B) Carbon, nitrogen, and oxygen
C) Hydrogen, oxygen, and nitrogen
D) Carbon, hydrogen, and phosphorus
Rationale: Carbohydrates are composed of carbon, hydrogen, and oxygen atoms. Examples
include glucose (C₆H₁₂O₆) and sucrose (C₁₂H₂₂O₁₁).
10. What is the primary difference between prokaryotic and eukaryotic cells?
A) Prokaryotic cells are larger than eukaryotic cells
B) Eukaryotic cells contain a nucleus, while prokaryotic cells do not
C) Prokaryotic cells have membrane-bound organelles, while eukaryotic cells do not
D) Eukaryotic cells are always unicellular
Rationale: Eukaryotic cells contain a membrane-enclosed nucleus, while prokaryotic cells lack a
nucleus and are classified as Bacteria or Archaea.
11. What are the main morphologies of bacteria?
A) Coccus, bacillus, vibrio, spirillum
B) Round, square, triangular, oval
C) Spherical, filamentous, branching, budding
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