Microbiology Exam 2025 With 100%
Correct Answers
Prokaryotes include
bacteria.
archaea.
both bacteria and archaea.
bacteria, archaea, and viruses. - CORRECT ANSWER✔✔both bacteria and archaea
Koch's postulates of disease outline a systematic process to directly link
an infectious agent to a disease.
an infection to a bacterium.
an infection to a fungus.
an infection to a virus. - CORRECT ANSWER✔✔an infectious agent to a disease
Louis Pasteur's S-necked flask experiment
proved spontaneous generation.
disproved spontaneous generation.
invented pasteurization.
none of the above. - CORRECT ANSWER✔✔disproved spontaneous generation
Endosymbiotic theory states that eukaryotic cells evolved from prokaryotic cells.
,True
False - CORRECT ANSWER✔✔true
Aseptic practices in surgery and nursing emerged as people
became more healthy.
loved antibiotics.
embraced biogenesis and the germ theory of disease.
believed in spontaneous generation. - CORRECT ANSWER✔✔embraced biogenesis and the
germ theory of disease
The term ________ is used to recognize genetic variants of the same species.
subspecies
family
strain
group - CORRECT ANSWER✔✔strain
The binomial nomenclature system involves naming organisms by their
domain and kingdom.
kingdom and phylum.
phylum and class.
genus and species. - CORRECT ANSWER✔✔genus and species
,The three domains of life are
bacteria, archaea, and eukarya.
prokaryotes, eukaryotes, and viruses.
prokaryotes, eukaryotes, and prions.
all of the above. - CORRECT ANSWER✔✔bacteria, archaea, and eukarya
The microbes that stably reside in and on us, which affect our physiology and susceptibility to
opportunistic pathogens, are called
infectious microbes.
normal microbiota.
pathogenic microorganisms.
opportunistic pathogens. - CORRECT ANSWER✔✔normal microbiota
Parasitism is a symbiotic relationship between
organisms that share the same ecological niche.
organisms that impact each other equally.
organisms that are not related.
host and pathogen. - CORRECT ANSWER✔✔host and pathogen
______________ uses visible light to illuminate the specimen with polarized light as opposed to
a hollow cone of unorganized non-polarized light used in phase contrast microscopes.
Differential interference contrast
Bright field
, Dark field
Compound light microscope - CORRECT ANSWER✔✔differential interference contrast
The purpose of using simple stains is to reveal
the color of the specimen.
the size, shape, and arrangement of the specimen.
the Gram type of the specimen.
the cell wall type of the specimen. - CORRECT ANSWER✔✔the size, shape, and arrangement of
the specimen
The __________ technique is often used to isolate individual colonies from a mixed culture.
streak plate
aseptic
transferring
all of the above - CORRECT ANSWER✔✔streak plate
The Gram stain is a differential stain that distinguishes ________ from _______ by highlighting
the differences in the peptidoglycan content of bacterial cell walls.
prokaryotes; eukaryotes
bacteria; archaea
bacteria; viruses
Gram-positive bacteria; Gram-negative bacteria - CORRECT ANSWER✔✔gram-positive bacteria;
gram-negative bacteria
Correct Answers
Prokaryotes include
bacteria.
archaea.
both bacteria and archaea.
bacteria, archaea, and viruses. - CORRECT ANSWER✔✔both bacteria and archaea
Koch's postulates of disease outline a systematic process to directly link
an infectious agent to a disease.
an infection to a bacterium.
an infection to a fungus.
an infection to a virus. - CORRECT ANSWER✔✔an infectious agent to a disease
Louis Pasteur's S-necked flask experiment
proved spontaneous generation.
disproved spontaneous generation.
invented pasteurization.
none of the above. - CORRECT ANSWER✔✔disproved spontaneous generation
Endosymbiotic theory states that eukaryotic cells evolved from prokaryotic cells.
,True
False - CORRECT ANSWER✔✔true
Aseptic practices in surgery and nursing emerged as people
became more healthy.
loved antibiotics.
embraced biogenesis and the germ theory of disease.
believed in spontaneous generation. - CORRECT ANSWER✔✔embraced biogenesis and the
germ theory of disease
The term ________ is used to recognize genetic variants of the same species.
subspecies
family
strain
group - CORRECT ANSWER✔✔strain
The binomial nomenclature system involves naming organisms by their
domain and kingdom.
kingdom and phylum.
phylum and class.
genus and species. - CORRECT ANSWER✔✔genus and species
,The three domains of life are
bacteria, archaea, and eukarya.
prokaryotes, eukaryotes, and viruses.
prokaryotes, eukaryotes, and prions.
all of the above. - CORRECT ANSWER✔✔bacteria, archaea, and eukarya
The microbes that stably reside in and on us, which affect our physiology and susceptibility to
opportunistic pathogens, are called
infectious microbes.
normal microbiota.
pathogenic microorganisms.
opportunistic pathogens. - CORRECT ANSWER✔✔normal microbiota
Parasitism is a symbiotic relationship between
organisms that share the same ecological niche.
organisms that impact each other equally.
organisms that are not related.
host and pathogen. - CORRECT ANSWER✔✔host and pathogen
______________ uses visible light to illuminate the specimen with polarized light as opposed to
a hollow cone of unorganized non-polarized light used in phase contrast microscopes.
Differential interference contrast
Bright field
, Dark field
Compound light microscope - CORRECT ANSWER✔✔differential interference contrast
The purpose of using simple stains is to reveal
the color of the specimen.
the size, shape, and arrangement of the specimen.
the Gram type of the specimen.
the cell wall type of the specimen. - CORRECT ANSWER✔✔the size, shape, and arrangement of
the specimen
The __________ technique is often used to isolate individual colonies from a mixed culture.
streak plate
aseptic
transferring
all of the above - CORRECT ANSWER✔✔streak plate
The Gram stain is a differential stain that distinguishes ________ from _______ by highlighting
the differences in the peptidoglycan content of bacterial cell walls.
prokaryotes; eukaryotes
bacteria; archaea
bacteria; viruses
Gram-positive bacteria; Gram-negative bacteria - CORRECT ANSWER✔✔gram-positive bacteria;
gram-negative bacteria
