Test Bank for Microbiology: A Systems Approach
7th Edition | Marjorie Kelly Cowan | All
Chapters 1–25 | Latest 2025
Question:1
Which of these is considered to be the smallest unit of life?
a) the nucleus
b) the mitochondrion
c) a plasmid
d) the cell
e) a prion ..ANSWER..d) The smallest unit of life is *the cell*.
Question:2
The study of microbiology includes all of the following EXCEPT _____ .
a) plants
b) viruses
c) bacteria
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,d) fungi
e) algae ..ANSWER..a) The study of microbiology includes all of the
following EXCEPT *plants*.
Question:3
What percent of the dry weight of the cell is composed of DNA?
a) 2 - 5
b) 12 -15
c) 25 - 30
d) 35 -40
e) 50 - 55 ..ANSWER..a) *2-5* % of the dry weight of the cell is
composed of DNA
Question:4
What are the three Domains of life?
a) Monera, Animals, and Plants
b) Bacteria, Archaea, and Eukarya
c) Prokaryote, Eukaryote, and Fungi
d) Animals, Plants, and Bacteria
e) Prokaryote, Eukaryote, Archaea ..ANSWER..b) *Bacteria, Achaea,
and Eukarya* are the three Domains of life.
2|Page
,Question:5
Which of the characteristics of life is not displayed by any individual
organism?
a) metabolism
b) growth
c) reproduction
d) evolution
e) response
f) homeostasis ..ANSWER..d) *Evolution* is NOT a characteristic of life
displayed by any individual organism.
Question:6
Viruses are considered "nonliving" for all of the following reasons
EXCEPT that they:
a) need a host cell for replication.
b) are metabolically inert.
c) possess DNA that can evolve.
d) do not maintain internal homeostasis.
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, e) are not responsive to environmental changes. ..ANSWER..c) Viruses
are considered "nonliving" for all of the following reasons EXCEPT that
they *possess DNA that can evolve*.
Question:7
Which is a macromolecular difference between the Domains Bacteria
and Archaea?
a) Archaea contain a nucleus and Bacteria do not.
b) Bacteria contain DNA and Archaea do not.
c) Bacteria contain a plasma membrane and Archaea do not.
d) Bacteria cell wall contains peptidoglycan and the Archaea cell wall
does not.
e) Archaea contain multiple types of RNA polymerase and Bacteria has
only one type. ..ANSWER..d) A macrobolecular difference between the
Domains Bacteria and Archaea is that *Bacteria cell wall contains
peptidoglycan and the Archaea cell wall does not*.
Question:8
The size and shapes of Archaean cells suggest relatedness to:
a) Bacteria
b) Prokaryotes
c) Eukaryotes
4|Page
7th Edition | Marjorie Kelly Cowan | All
Chapters 1–25 | Latest 2025
Question:1
Which of these is considered to be the smallest unit of life?
a) the nucleus
b) the mitochondrion
c) a plasmid
d) the cell
e) a prion ..ANSWER..d) The smallest unit of life is *the cell*.
Question:2
The study of microbiology includes all of the following EXCEPT _____ .
a) plants
b) viruses
c) bacteria
1|Page
,d) fungi
e) algae ..ANSWER..a) The study of microbiology includes all of the
following EXCEPT *plants*.
Question:3
What percent of the dry weight of the cell is composed of DNA?
a) 2 - 5
b) 12 -15
c) 25 - 30
d) 35 -40
e) 50 - 55 ..ANSWER..a) *2-5* % of the dry weight of the cell is
composed of DNA
Question:4
What are the three Domains of life?
a) Monera, Animals, and Plants
b) Bacteria, Archaea, and Eukarya
c) Prokaryote, Eukaryote, and Fungi
d) Animals, Plants, and Bacteria
e) Prokaryote, Eukaryote, Archaea ..ANSWER..b) *Bacteria, Achaea,
and Eukarya* are the three Domains of life.
2|Page
,Question:5
Which of the characteristics of life is not displayed by any individual
organism?
a) metabolism
b) growth
c) reproduction
d) evolution
e) response
f) homeostasis ..ANSWER..d) *Evolution* is NOT a characteristic of life
displayed by any individual organism.
Question:6
Viruses are considered "nonliving" for all of the following reasons
EXCEPT that they:
a) need a host cell for replication.
b) are metabolically inert.
c) possess DNA that can evolve.
d) do not maintain internal homeostasis.
3|Page
, e) are not responsive to environmental changes. ..ANSWER..c) Viruses
are considered "nonliving" for all of the following reasons EXCEPT that
they *possess DNA that can evolve*.
Question:7
Which is a macromolecular difference between the Domains Bacteria
and Archaea?
a) Archaea contain a nucleus and Bacteria do not.
b) Bacteria contain DNA and Archaea do not.
c) Bacteria contain a plasma membrane and Archaea do not.
d) Bacteria cell wall contains peptidoglycan and the Archaea cell wall
does not.
e) Archaea contain multiple types of RNA polymerase and Bacteria has
only one type. ..ANSWER..d) A macrobolecular difference between the
Domains Bacteria and Archaea is that *Bacteria cell wall contains
peptidoglycan and the Archaea cell wall does not*.
Question:8
The size and shapes of Archaean cells suggest relatedness to:
a) Bacteria
b) Prokaryotes
c) Eukaryotes
4|Page
