Test Bank Bundle: Brock Biology of
Microorganisms | Verified MCQs & Answers
| A+ Exam Prep 2025/2026
Which of the following statements is FALSE? - answers Microbial cells include both
bacteria and viruses.
Which of the following statements is correct? - answers Microorganisms are significant
contributors to the total biomass on Earth.
Differential selection and reproduction of phenotypes occurs during a process called -
answers evolution
In what/which domain(s) of life is/are microorganisms represented? - answers Archaea,
Bacteria, and Eukarya
Biological catalysts involved in the acceleration of the rate of chemical reactions are
called - answers enzymes
Regarding early life on Earth - answers microbial life existed for billions of years before
plant and animal life.
The person who described the "wee animalcules" was - answers Antoni van
Leeuwenhoek
Walther Hesse and _____________ pioneered the use of agar as a solidifying agent -
answers Robert Koch
Which of the following is/are characteristic of all cellular organisms? - answers evolution
Deduce why viruses are excluded from the ribosomal RNA- based tree of life - answers
they lack ribosomal RNA (rRNA)
Louise Pasteur developed the vaccine(s) for - answers anthrax, fowl cholera, and rabies
The discovery of antibiotics and other important chemicals led to the field of - answers
industrial microbiology
Microbial sterilization is used to - answers kill all microbes in or on objects
Transparent double-sided dishes used for growing microbes are most commonly called
- answers petri dishes
,Microbes playing a role in nitrogen fixation in plants live in ________, while those
playing a role in the digestive tract of certain herbivores live in ________. - answers
nodules / rumens
Which of the following is NOT an accomplishment of Louis Pasteur? - answers
developed enrichment culture techniques
The theory of spontaneous generation was refuted by the work of - answers Louis
Pasteur
A Pasteur flask has a(n) - answers swan neck to prevent particulate matter from getting
into the main body of the flask.
Predict how Pasteur's conclusions on spontaneous generation with swan flasks would
have changed if he worked with and maintained the flasks in a sterile laminar flow hood.
- answers Pasteur's flasks never would have putrefied (decayed/rotted), and the
experiment would not have refuted spontaneous generation.
A pure culture - answers is a population of identical cells
Martinus Beijerinck was the first to isolate - answers green algae, certain nitrogen-fixing
root nodule bacteria, and certain sulfate-reducing bacteria.
Chemolithotrophy involves - answers oxidation of inorganic compounds
Developments in the fields of immunology and medical microbiology were practical
extensions of the work of - answers Robert Koch
Microbial control in wastewaters would most logically be a part of - answers aquatic
microbiology
Robert Koch contributed to the field of microbiology by being the first person to -
answers develop the tuberculin test, formulate four postulates for definitively linking a
specific microorganism to a specific disease, and use agar as a solidifying agent in
growth media
Mycobacterium tuberculosis is very difficult to stain because of the - answers large
amounts of a waxlike lipids present in its cell wall
Louis Pasteur's most famous success was his work on - answers the rabies vaccine
Microorganisms play key roles in the cycling of important nutrients in plant nutrition,
particularly those of - answers carbon, nitrogen, and sulfur
Microbial ecology is the study of - answers microorganisms in their natural
environments
,The structure that confers structural strength on the cell is known as the - answers cell
wall
A microbial cell's membrane is considered ________, because its internal constituents
are maintained within the cell. However, it also imports and exports other molecules in
response to its environment. - answers semipermeable
Some microorganisms can undergo ________ in which various cell types can become
specialized and arise from one parent cell type. - answers differentiation
Cyanobacteria and purple sulfur bacteria both obtain energy from light. However, only
the ________ are capable of releasing ________. - answers cyanobacteria / oxygen
The process whereby microorganisms are used to help clean up pollution created by
human activities is known as - answers bioremediation
Robert Koch received the 1905 Nobel Prize in Physiology or Medicine for - answers
identifying Mycobacterium tuberculosis as the causative agent of tuberculosis
Bacillus anthracis deficient in its ability to differentiate would not be able to - answers
form endospores
Microbial biochemistry most specifically involves the discovery of microbial ________
and the ________ they perform. - answers biomolecules / functions
Microbial cells first evolved on Earth approximately ________ billion years ago. -
answers 3.8 to 4.3
The disease anthrax is caused by the pathogenic bacterium ________, which produces
heat- resistant structures known as ________. - answers Bacillus anthracis /
endospores
The first documented description of a microorganism was of a ________ by ________. -
answers mold / Robert Hooke
________ produced by microbial fermentation of glucose from cellulose or cornstarch is
becoming a more important component of biofuels in the United States, and specialized
________ are needed to make this a commercially available product. - answers Ethanol
/ industrial microbiologists
________ was the first to describe microorganisms, while ________ was the first
person to see bacteria. - answers Robert Hooke / Antoni van Leeuwenhoek
, The production of human proteins (e.g., insulin) by genetically engineered
microorganisms is an example of ________, a subdiscipline of microbiology. - answers
biotechnology
Approximately two billion years ago, ________ were primarily responsible for initially
oxygenating Earth. - answers cyanobacteria
Archaea and Bacteria are unified as prokaryotes in lacking ________ which Eukarya
contain, such as mitochondria. - answers nuclei and membrane-enclosed organelles
Bioremediation ________ by introducing pollutant-consuming microorganisms or
specific nutrients that help microorganisms degrade pollutants. - answers accelerates
the natural cleanup process
________ was the first to identify a new form of autotrophy in which energy is obtained
from oxidizing inorganic compounds called ________. - answers Sergei Winogradsky /
chemolithotrophy
Electron microscopy has greater ________ than light microscopy, because the
wavelength of visible light is much larger than the wavelength of electrons. - answers
resolution
Which of the following types of microscopy is especially effective for viewing details of
internal structures within live cells? - answers phase-contrast microscopy
Which of the following types of microscopy could be used to visualize the layers of the
cell membrane and the cell wall? - answers transmission electron microscopy
Who was the first researcher to provide direct experimental data that supported the
germ theory to explain infectious disease? - answers Koch
When medical devices are left in the body, bacteria may grow on them as ________,
which makes them especially resistant to treatment. - answers communities
Microbes that live at high temperatures in hot springs are ________. - answers called
extremophiles.
What field focuses specifically on the use of microbes to make products, such as
antibiotics, on a large scale? - answers industrial ecology
Which statement about the relationship between microbes and humans is FALSE? -
answers Most microbes are pathogenic.
Why is ribosomal RNA especially useful for the study of phylogenetic relationships? -
answers It is highly conserved.
Microorganisms | Verified MCQs & Answers
| A+ Exam Prep 2025/2026
Which of the following statements is FALSE? - answers Microbial cells include both
bacteria and viruses.
Which of the following statements is correct? - answers Microorganisms are significant
contributors to the total biomass on Earth.
Differential selection and reproduction of phenotypes occurs during a process called -
answers evolution
In what/which domain(s) of life is/are microorganisms represented? - answers Archaea,
Bacteria, and Eukarya
Biological catalysts involved in the acceleration of the rate of chemical reactions are
called - answers enzymes
Regarding early life on Earth - answers microbial life existed for billions of years before
plant and animal life.
The person who described the "wee animalcules" was - answers Antoni van
Leeuwenhoek
Walther Hesse and _____________ pioneered the use of agar as a solidifying agent -
answers Robert Koch
Which of the following is/are characteristic of all cellular organisms? - answers evolution
Deduce why viruses are excluded from the ribosomal RNA- based tree of life - answers
they lack ribosomal RNA (rRNA)
Louise Pasteur developed the vaccine(s) for - answers anthrax, fowl cholera, and rabies
The discovery of antibiotics and other important chemicals led to the field of - answers
industrial microbiology
Microbial sterilization is used to - answers kill all microbes in or on objects
Transparent double-sided dishes used for growing microbes are most commonly called
- answers petri dishes
,Microbes playing a role in nitrogen fixation in plants live in ________, while those
playing a role in the digestive tract of certain herbivores live in ________. - answers
nodules / rumens
Which of the following is NOT an accomplishment of Louis Pasteur? - answers
developed enrichment culture techniques
The theory of spontaneous generation was refuted by the work of - answers Louis
Pasteur
A Pasteur flask has a(n) - answers swan neck to prevent particulate matter from getting
into the main body of the flask.
Predict how Pasteur's conclusions on spontaneous generation with swan flasks would
have changed if he worked with and maintained the flasks in a sterile laminar flow hood.
- answers Pasteur's flasks never would have putrefied (decayed/rotted), and the
experiment would not have refuted spontaneous generation.
A pure culture - answers is a population of identical cells
Martinus Beijerinck was the first to isolate - answers green algae, certain nitrogen-fixing
root nodule bacteria, and certain sulfate-reducing bacteria.
Chemolithotrophy involves - answers oxidation of inorganic compounds
Developments in the fields of immunology and medical microbiology were practical
extensions of the work of - answers Robert Koch
Microbial control in wastewaters would most logically be a part of - answers aquatic
microbiology
Robert Koch contributed to the field of microbiology by being the first person to -
answers develop the tuberculin test, formulate four postulates for definitively linking a
specific microorganism to a specific disease, and use agar as a solidifying agent in
growth media
Mycobacterium tuberculosis is very difficult to stain because of the - answers large
amounts of a waxlike lipids present in its cell wall
Louis Pasteur's most famous success was his work on - answers the rabies vaccine
Microorganisms play key roles in the cycling of important nutrients in plant nutrition,
particularly those of - answers carbon, nitrogen, and sulfur
Microbial ecology is the study of - answers microorganisms in their natural
environments
,The structure that confers structural strength on the cell is known as the - answers cell
wall
A microbial cell's membrane is considered ________, because its internal constituents
are maintained within the cell. However, it also imports and exports other molecules in
response to its environment. - answers semipermeable
Some microorganisms can undergo ________ in which various cell types can become
specialized and arise from one parent cell type. - answers differentiation
Cyanobacteria and purple sulfur bacteria both obtain energy from light. However, only
the ________ are capable of releasing ________. - answers cyanobacteria / oxygen
The process whereby microorganisms are used to help clean up pollution created by
human activities is known as - answers bioremediation
Robert Koch received the 1905 Nobel Prize in Physiology or Medicine for - answers
identifying Mycobacterium tuberculosis as the causative agent of tuberculosis
Bacillus anthracis deficient in its ability to differentiate would not be able to - answers
form endospores
Microbial biochemistry most specifically involves the discovery of microbial ________
and the ________ they perform. - answers biomolecules / functions
Microbial cells first evolved on Earth approximately ________ billion years ago. -
answers 3.8 to 4.3
The disease anthrax is caused by the pathogenic bacterium ________, which produces
heat- resistant structures known as ________. - answers Bacillus anthracis /
endospores
The first documented description of a microorganism was of a ________ by ________. -
answers mold / Robert Hooke
________ produced by microbial fermentation of glucose from cellulose or cornstarch is
becoming a more important component of biofuels in the United States, and specialized
________ are needed to make this a commercially available product. - answers Ethanol
/ industrial microbiologists
________ was the first to describe microorganisms, while ________ was the first
person to see bacteria. - answers Robert Hooke / Antoni van Leeuwenhoek
, The production of human proteins (e.g., insulin) by genetically engineered
microorganisms is an example of ________, a subdiscipline of microbiology. - answers
biotechnology
Approximately two billion years ago, ________ were primarily responsible for initially
oxygenating Earth. - answers cyanobacteria
Archaea and Bacteria are unified as prokaryotes in lacking ________ which Eukarya
contain, such as mitochondria. - answers nuclei and membrane-enclosed organelles
Bioremediation ________ by introducing pollutant-consuming microorganisms or
specific nutrients that help microorganisms degrade pollutants. - answers accelerates
the natural cleanup process
________ was the first to identify a new form of autotrophy in which energy is obtained
from oxidizing inorganic compounds called ________. - answers Sergei Winogradsky /
chemolithotrophy
Electron microscopy has greater ________ than light microscopy, because the
wavelength of visible light is much larger than the wavelength of electrons. - answers
resolution
Which of the following types of microscopy is especially effective for viewing details of
internal structures within live cells? - answers phase-contrast microscopy
Which of the following types of microscopy could be used to visualize the layers of the
cell membrane and the cell wall? - answers transmission electron microscopy
Who was the first researcher to provide direct experimental data that supported the
germ theory to explain infectious disease? - answers Koch
When medical devices are left in the body, bacteria may grow on them as ________,
which makes them especially resistant to treatment. - answers communities
Microbes that live at high temperatures in hot springs are ________. - answers called
extremophiles.
What field focuses specifically on the use of microbes to make products, such as
antibiotics, on a large scale? - answers industrial ecology
Which statement about the relationship between microbes and humans is FALSE? -
answers Most microbes are pathogenic.
Why is ribosomal RNA especially useful for the study of phylogenetic relationships? -
answers It is highly conserved.
