BIOD 171 OR BIOL271
MICROBIOLOGY W/LAB | MODULE 1
EXAM 2026/2027 WITH 100
QUESTIONS AND EXPERT-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ | GUARANTEED PASS
1. True/False: A virus is considered a microorganism.
Answer: False
Rationale: Viruses are not living and are therefore not considered microorganisms.
However, they can be classified as microbes, a more general term that includes
both microorganisms and viruses.
2. True or False: The smallest biological unit of life is the molecule.
Answer: False
,Rationale: The smallest biological unit of life is the cell.
3. What is the smallest biological unit of life?
Answer: A cell
4. At a generalized level, all cells are comprised of what?
Answer: Macromolecules — specifically, Proteins, Lipids, Nucleic Acids, and
Carbohydrates
5. Microbiology is the study of what?
Answer: Microbiology is the study of microbes (microorganisms and viruses) and
their biological processes.
6. True or False: All microorganisms are harmful pathogens.
Answer: False
Rationale: Many microbes are beneficial or neutral.
7. Which of the following is NOT considered a microorganism?
a) Algae
b) Protozoa
c) Virus
d) Mushroom
Answer: d) Mushroom
Rationale: While fungi are microorganisms, macroscopic fungi like mushrooms
are not typically studied at the microscopic level. Viruses are not living organisms
but are considered microbes.
, 8. Which of the following is considered a "microbe" but is not technically
classified as a "microorganism"?
Answer: Virus
9. The three-domain system of classification includes:
a) Bacteria, Protista, Eukarya
b) Bacteria, Archaea, Eukarya
c) Prokaryota, Eukaryota, Viruses
d) Animalia, Plantae, Fungi
Answer: b) Bacteria, Archaea, Eukarya
Rationale: This system, established by Carl Woese, categorizes all life based on
ribosomal RNA differences.
10. Which scientist is credited with the discovery of "animalcules"
(microorganisms) using the first simple microscope?
a) Robert Hooke
b) Antonie van Leeuwenhoek
c) Louis Pasteur
d) Robert Koch
Answer: b) Antonie van Leeuwenhoek
Rationale: Leeuwenhoek was the first to observe and describe live
microorganisms, which he called "animalcules."
11. Which scientist coined the term "cell"?
Answer: Robert Hooke
12. The germ theory of disease — which states that specific microorganisms
cause specific infectious diseases — was definitively proven by:
a) Louis Pasteur's swan-neck flask experiment
b) Joseph Lister's use of phenol
MICROBIOLOGY W/LAB | MODULE 1
EXAM 2026/2027 WITH 100
QUESTIONS AND EXPERT-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ | GUARANTEED PASS
1. True/False: A virus is considered a microorganism.
Answer: False
Rationale: Viruses are not living and are therefore not considered microorganisms.
However, they can be classified as microbes, a more general term that includes
both microorganisms and viruses.
2. True or False: The smallest biological unit of life is the molecule.
Answer: False
,Rationale: The smallest biological unit of life is the cell.
3. What is the smallest biological unit of life?
Answer: A cell
4. At a generalized level, all cells are comprised of what?
Answer: Macromolecules — specifically, Proteins, Lipids, Nucleic Acids, and
Carbohydrates
5. Microbiology is the study of what?
Answer: Microbiology is the study of microbes (microorganisms and viruses) and
their biological processes.
6. True or False: All microorganisms are harmful pathogens.
Answer: False
Rationale: Many microbes are beneficial or neutral.
7. Which of the following is NOT considered a microorganism?
a) Algae
b) Protozoa
c) Virus
d) Mushroom
Answer: d) Mushroom
Rationale: While fungi are microorganisms, macroscopic fungi like mushrooms
are not typically studied at the microscopic level. Viruses are not living organisms
but are considered microbes.
, 8. Which of the following is considered a "microbe" but is not technically
classified as a "microorganism"?
Answer: Virus
9. The three-domain system of classification includes:
a) Bacteria, Protista, Eukarya
b) Bacteria, Archaea, Eukarya
c) Prokaryota, Eukaryota, Viruses
d) Animalia, Plantae, Fungi
Answer: b) Bacteria, Archaea, Eukarya
Rationale: This system, established by Carl Woese, categorizes all life based on
ribosomal RNA differences.
10. Which scientist is credited with the discovery of "animalcules"
(microorganisms) using the first simple microscope?
a) Robert Hooke
b) Antonie van Leeuwenhoek
c) Louis Pasteur
d) Robert Koch
Answer: b) Antonie van Leeuwenhoek
Rationale: Leeuwenhoek was the first to observe and describe live
microorganisms, which he called "animalcules."
11. Which scientist coined the term "cell"?
Answer: Robert Hooke
12. The germ theory of disease — which states that specific microorganisms
cause specific infectious diseases — was definitively proven by:
a) Louis Pasteur's swan-neck flask experiment
b) Joseph Lister's use of phenol
