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PORTAGE LEARNING BIOD 171 MODULES 1-8
COMPREHENSIVE FINAL ACTUAL EXAM PREP
2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES
ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED |HIGHLY
RECOMMENDED!!
1. A virus is classified as a microorganism. True or False?
A) True
B) False
C) True, but only if it contains DNA
D) True, only when actively replicating
Rationale: Viruses are not considered living organisms and therefore
are not classified as microorganisms. They are acellular infectious
agents that require a host cell to replicate.
2. Which of the following is the correct order of taxonomic classification
from broadest to most specific?
A) Species, Genus, Family, Order, Class, Phylum, Kingdom, Domain
B) Domain, Kingdom, Phylum, Class, Order, Family, Genus,
Species
C) Kingdom, Domain, Phylum, Class, Order, Family, Genus, Species
D) Domain, Kingdom, Phylum, Order, Class, Family, Genus, Species
Rationale: The taxonomic hierarchy from broadest to most specific is:
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
This system organizes living organisms based on shared
characteristics.
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3. Which of the following is NOT one of the four main types of
macromolecules found in cells?
A) Carbohydrates
B) Lipids
C) Proteins
D) Minerals
Rationale: The four main types of macromolecules found in cells are
carbohydrates, lipids, proteins, and nucleic acids. Minerals are
inorganic compounds and are not classified as macromolecules.
4. What is the primary function of the bacterial cell wall?
A) Provide structural support and protection against osmotic
pressure
B) Store genetic information
C) Produce ATP
D) Enable movement
Rationale: The bacterial cell wall provides structural support,
maintains cell shape, and protects the cell from osmotic pressure and
mechanical damage.
5. Which of the following structures is found in ALL bacterial cells?
A) Capsule
B) Flagella
C) Ribosomes
D) Plasmid
Rationale: Ribosomes are essential for protein synthesis and are found
in all bacterial cells. Capsules, flagella, and plasmids are not present
in all bacteria.
6. A patient presents with symptoms of a bacterial infection. A Gram
stain reveals purple-colored cells. The bacteria are most likely:
A) Gram-positive
B) Gram-negative
C) Acid-fast
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D) Gram-variable
Rationale: Gram-positive bacteria appear purple (or blue) after Gram
staining due to the thick peptidoglycan layer in their cell wall that
retains the crystal violet-iodine complex.
7. Which of the following is a characteristic of Gram-negative bacteria?
A) Thick peptidoglycan layer
B) Presence of lipopolysaccharides (LPS) in the outer membrane
C) Absence of an outer membrane
D) Teichoic acids in the cell wall
Rationale: Gram-negative bacteria have a thin peptidoglycan layer
and an outer membrane containing lipopolysaccharides (LPS). Gram-
positive bacteria have a thick peptidoglycan layer with teichoic acids.
8. Which bacterial structure is responsible for attachment to surfaces and
genetic exchange?
A) Flagella
B) Capsule
C) Pili
D) Endospore
Rationale: Pili (or fimbriae) facilitate attachment to surfaces and are
involved in conjugation, a method of horizontal gene transfer.
Flagella are for movement.
9. Endospores are bacterial structures that function to:
A) Enable movement
B) Allow survival under harsh conditions
C) Facilitate genetic exchange
D) Attach to surfaces
Rationale: Endospores are highly resistant structures that allow
bacteria to survive under harsh environmental conditions such as
heat, desiccation, and UV radiation.
10. Which of the following is an example of a prokaryotic organism?
A) Escherichia coli
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B) Saccharomyces cerevisiae
C) Penicillium notatum
D) Paramecium caudatum
Rationale: Escherichia coli is a prokaryotic bacterium. Saccharomyces
cerevisiae (yeast) and Penicillium notatum (fungus) are eukaryotes.
Paramecium is a eukaryotic protist.
11. The plasma membrane is composed primarily of:
A) Cellulose
B) Phospholipids and proteins
C) Peptidoglycan
D) Chitin
Rationale: The plasma membrane is a phospholipid bilayer with
embedded proteins. It is found in both prokaryotic and eukaryotic
cells.
12. Which of the following is a characteristic of eukaryotic cells?
A) Lack of membrane-bound organelles
B) Presence of 70S ribosomes
C) Presence of a nucleus enclosed within a membrane
D) Circular chromosome
Rationale: Eukaryotic cells have a nucleus enclosed within a nuclear
membrane, membrane-bound organelles (mitochondria, ER, Golgi),
larger 80S ribosomes, linear chromosomes, and divide by mitosis and
meiosis.
13. The three domains of life are:
A) Bacteria, Archaea, Eukarya
B) Prokaryota, Eukaryota, Monera
C) Plantae, Animalia, Fungi
D) Protista, Archaea, Bacteria
Rationale: The three domains of life are Bacteria, Archaea, and
Eukarya. This classification is based on differences in ribosomal RNA
sequences and cell structure.
PORTAGE LEARNING BIOD 171 MODULES 1-8
COMPREHENSIVE FINAL ACTUAL EXAM PREP
2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES
ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED |HIGHLY
RECOMMENDED!!
1. A virus is classified as a microorganism. True or False?
A) True
B) False
C) True, but only if it contains DNA
D) True, only when actively replicating
Rationale: Viruses are not considered living organisms and therefore
are not classified as microorganisms. They are acellular infectious
agents that require a host cell to replicate.
2. Which of the following is the correct order of taxonomic classification
from broadest to most specific?
A) Species, Genus, Family, Order, Class, Phylum, Kingdom, Domain
B) Domain, Kingdom, Phylum, Class, Order, Family, Genus,
Species
C) Kingdom, Domain, Phylum, Class, Order, Family, Genus, Species
D) Domain, Kingdom, Phylum, Order, Class, Family, Genus, Species
Rationale: The taxonomic hierarchy from broadest to most specific is:
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
This system organizes living organisms based on shared
characteristics.
,2|Page
3. Which of the following is NOT one of the four main types of
macromolecules found in cells?
A) Carbohydrates
B) Lipids
C) Proteins
D) Minerals
Rationale: The four main types of macromolecules found in cells are
carbohydrates, lipids, proteins, and nucleic acids. Minerals are
inorganic compounds and are not classified as macromolecules.
4. What is the primary function of the bacterial cell wall?
A) Provide structural support and protection against osmotic
pressure
B) Store genetic information
C) Produce ATP
D) Enable movement
Rationale: The bacterial cell wall provides structural support,
maintains cell shape, and protects the cell from osmotic pressure and
mechanical damage.
5. Which of the following structures is found in ALL bacterial cells?
A) Capsule
B) Flagella
C) Ribosomes
D) Plasmid
Rationale: Ribosomes are essential for protein synthesis and are found
in all bacterial cells. Capsules, flagella, and plasmids are not present
in all bacteria.
6. A patient presents with symptoms of a bacterial infection. A Gram
stain reveals purple-colored cells. The bacteria are most likely:
A) Gram-positive
B) Gram-negative
C) Acid-fast
,3|Page
D) Gram-variable
Rationale: Gram-positive bacteria appear purple (or blue) after Gram
staining due to the thick peptidoglycan layer in their cell wall that
retains the crystal violet-iodine complex.
7. Which of the following is a characteristic of Gram-negative bacteria?
A) Thick peptidoglycan layer
B) Presence of lipopolysaccharides (LPS) in the outer membrane
C) Absence of an outer membrane
D) Teichoic acids in the cell wall
Rationale: Gram-negative bacteria have a thin peptidoglycan layer
and an outer membrane containing lipopolysaccharides (LPS). Gram-
positive bacteria have a thick peptidoglycan layer with teichoic acids.
8. Which bacterial structure is responsible for attachment to surfaces and
genetic exchange?
A) Flagella
B) Capsule
C) Pili
D) Endospore
Rationale: Pili (or fimbriae) facilitate attachment to surfaces and are
involved in conjugation, a method of horizontal gene transfer.
Flagella are for movement.
9. Endospores are bacterial structures that function to:
A) Enable movement
B) Allow survival under harsh conditions
C) Facilitate genetic exchange
D) Attach to surfaces
Rationale: Endospores are highly resistant structures that allow
bacteria to survive under harsh environmental conditions such as
heat, desiccation, and UV radiation.
10. Which of the following is an example of a prokaryotic organism?
A) Escherichia coli
, 4|Page
B) Saccharomyces cerevisiae
C) Penicillium notatum
D) Paramecium caudatum
Rationale: Escherichia coli is a prokaryotic bacterium. Saccharomyces
cerevisiae (yeast) and Penicillium notatum (fungus) are eukaryotes.
Paramecium is a eukaryotic protist.
11. The plasma membrane is composed primarily of:
A) Cellulose
B) Phospholipids and proteins
C) Peptidoglycan
D) Chitin
Rationale: The plasma membrane is a phospholipid bilayer with
embedded proteins. It is found in both prokaryotic and eukaryotic
cells.
12. Which of the following is a characteristic of eukaryotic cells?
A) Lack of membrane-bound organelles
B) Presence of 70S ribosomes
C) Presence of a nucleus enclosed within a membrane
D) Circular chromosome
Rationale: Eukaryotic cells have a nucleus enclosed within a nuclear
membrane, membrane-bound organelles (mitochondria, ER, Golgi),
larger 80S ribosomes, linear chromosomes, and divide by mitosis and
meiosis.
13. The three domains of life are:
A) Bacteria, Archaea, Eukarya
B) Prokaryota, Eukaryota, Monera
C) Plantae, Animalia, Fungi
D) Protista, Archaea, Bacteria
Rationale: The three domains of life are Bacteria, Archaea, and
Eukarya. This classification is based on differences in ribosomal RNA
sequences and cell structure.
