Page |1
Prescott’s Microbiology: A Human Perspective By Denise Anderson, Sarah
Salm, Mira Beins and Eugene Nester |Actual Questions and Correct
Answers |Latest Update2025/2026 Already Graded A+
Viruses are:
a. infectious agents that infect multi-cellular organism
b. noncellular particles that take over the metabolism of a cell to generate more virus particles
c. pathogens that replicate in complex growth media
d. cellular particles that belong to the archaea domain
e. microbes that consist of lipid membrane enclosed genomes - Ans ✓✓ b. noncellular
particles that take over the metabolism of a cell the generate more virus particles
Analysis of DNA sequences reveals:
a. the ancient convergence of two cell types ex. prokaryotes and eukaryotes
b. prokaryotes and eukaryotes evolved from a common ancestral cell
c. the bacteria share common ancestor with archaea, but not with eukarya
d. prokaryotes are cells with a nucleus
e. the genome of Haemophilus influenzae has about 2 billion base bares - Ans ✓✓ b.
prokaryotes and eukaryotes evolved from a common ancestral cell
Which of these groups are considered to be microbes but NOT considered to be cells?
, Page |2
a. viruses
b. bacteria
c. archaea
d. protists
e. filamentous fungi - Ans ✓✓ a. viruses
a microbe is commonly defined as
a. a virus that requires a microscope to be seen
b. a bacterium that requires a microscope to be seen
c. a single-cellular prokaryote that requires a microscope to be seen
d. a multicellular eukaryote that requires a microscope to be seen
e. a living organism that requires a microscope to be seen - Ans ✓✓ e. a living organism that
requires a microscope to be seen
which one of the following statements regarding microbial cells is NOT true?
a. microbial cells acquire food, gain energy to build themselves, and respond to
environmental changes
, Page |3
b. most single -celled organisms require a microscope to render them visible, but some
bacterial cells are large enough to be seen with naked eye
c. microbes function as individual entities
d. many microbes form complex multicellular assemblages
e. viruses are not considered as microbial cells - Ans ✓✓ c. microbes function as individual
entities
which of the following statements is FALSE?
a. a genome is the total genetic information contained in an organism's chromosomal DNA
b. if a microbe's genome includes genes for nitrogenase, that microbe probably can fix
nitrogen
c. by comparing DNA sequences of different organism, we can figure out how closely related
they are
d. fred sanger developed the first applicable DNA sequencing method
e. Fred sanger completed the sequences of Haemophilus influenzae - Ans ✓✓ Fred Sanger
completed the sequences of Haemophilus influenzae
the first cellular genome to be sequences were those of
a. humans
, Page |4
b. bacteria
c. viruses
d. prions
e. fungi - Ans ✓✓ b. bacteria
the environment of the early Earth may have contained all of the following
a. ferrous iron
b. methane
c. ammonia
d. oxygen
e. hydrogen gas - Ans ✓✓ d. oxygen
the development of the theory of the "RNA world" resulted from the discovery
a. archaea
b. prions
c. bacteria
d. ribozymes
e. endosymbioints - Ans ✓✓ d. ribozymes
which microbes may resemble those of the earliest life forms?
a. archaea
b. photosynthetic algae
c. viruses
d. cyanobacteria
Prescott’s Microbiology: A Human Perspective By Denise Anderson, Sarah
Salm, Mira Beins and Eugene Nester |Actual Questions and Correct
Answers |Latest Update2025/2026 Already Graded A+
Viruses are:
a. infectious agents that infect multi-cellular organism
b. noncellular particles that take over the metabolism of a cell to generate more virus particles
c. pathogens that replicate in complex growth media
d. cellular particles that belong to the archaea domain
e. microbes that consist of lipid membrane enclosed genomes - Ans ✓✓ b. noncellular
particles that take over the metabolism of a cell the generate more virus particles
Analysis of DNA sequences reveals:
a. the ancient convergence of two cell types ex. prokaryotes and eukaryotes
b. prokaryotes and eukaryotes evolved from a common ancestral cell
c. the bacteria share common ancestor with archaea, but not with eukarya
d. prokaryotes are cells with a nucleus
e. the genome of Haemophilus influenzae has about 2 billion base bares - Ans ✓✓ b.
prokaryotes and eukaryotes evolved from a common ancestral cell
Which of these groups are considered to be microbes but NOT considered to be cells?
, Page |2
a. viruses
b. bacteria
c. archaea
d. protists
e. filamentous fungi - Ans ✓✓ a. viruses
a microbe is commonly defined as
a. a virus that requires a microscope to be seen
b. a bacterium that requires a microscope to be seen
c. a single-cellular prokaryote that requires a microscope to be seen
d. a multicellular eukaryote that requires a microscope to be seen
e. a living organism that requires a microscope to be seen - Ans ✓✓ e. a living organism that
requires a microscope to be seen
which one of the following statements regarding microbial cells is NOT true?
a. microbial cells acquire food, gain energy to build themselves, and respond to
environmental changes
, Page |3
b. most single -celled organisms require a microscope to render them visible, but some
bacterial cells are large enough to be seen with naked eye
c. microbes function as individual entities
d. many microbes form complex multicellular assemblages
e. viruses are not considered as microbial cells - Ans ✓✓ c. microbes function as individual
entities
which of the following statements is FALSE?
a. a genome is the total genetic information contained in an organism's chromosomal DNA
b. if a microbe's genome includes genes for nitrogenase, that microbe probably can fix
nitrogen
c. by comparing DNA sequences of different organism, we can figure out how closely related
they are
d. fred sanger developed the first applicable DNA sequencing method
e. Fred sanger completed the sequences of Haemophilus influenzae - Ans ✓✓ Fred Sanger
completed the sequences of Haemophilus influenzae
the first cellular genome to be sequences were those of
a. humans
, Page |4
b. bacteria
c. viruses
d. prions
e. fungi - Ans ✓✓ b. bacteria
the environment of the early Earth may have contained all of the following
a. ferrous iron
b. methane
c. ammonia
d. oxygen
e. hydrogen gas - Ans ✓✓ d. oxygen
the development of the theory of the "RNA world" resulted from the discovery
a. archaea
b. prions
c. bacteria
d. ribozymes
e. endosymbioints - Ans ✓✓ d. ribozymes
which microbes may resemble those of the earliest life forms?
a. archaea
b. photosynthetic algae
c. viruses
d. cyanobacteria
