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Microbiology by OpenStax , 1st Edition by Nina Parker,
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Test Bank for Microbiology by OpenStax , 1st Edition by NinaParker, 9781938168147, Covering Chapters 1-26 | Includes
Rationales
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*.
The study of microbiology includes all of the following EXCEPT _____ .
a) plants
b) viruses
c) bacteria
d) fungi
e) algae - ANSWER: a) The study of microbiology includes all of the following EXCEPT *plants*.
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
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.
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.
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.
,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*.
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*.
The size and shapes of Archaean cells suggest relatedness to:
a) Bacteria
b) Prokaryotes
c) Eukaryotes
d) All other life forms
e) No other life forms; their sizes and shapes are unique - ANSWER: a) the size and shapes of
Archaean cells suggest relatedness to *Bacteria*
Phosholipid structure in Archaean cells suggests relatedness to:
a) Bacteria
b) Prokaryotes
c) Eukaryotes
d) All other life forms
e) No other life forms; their structure is unique - ANSWER: e) Phospholipid structure in Archaean cells
suggests relatedness to *no other life forms; their structure is unique*
Which molecular tool most assisted in providing a more reliable way to verify the assertions made by
Woese et al in their 1990 paper on phylogeny?
a) Polymerase chain reaction
b) RNA to DNA conversion using reverse transcriptase
c) RNA sequencing
d) DNA sequencing
e) Protein sequencing - ANSWER: a) *Polymerase chain reaction* was the molecular tool used to
provide a more reliable way to verify the assertions made by Woese et al in their 1990 paper on
phylogeny
If E. coli DNA polymerase, not Taq polymerase were used in polymerase chain reaction assays to
amplify SSUrRNA gene sequences, we would expect to see:
a) increased short fragment DNA sequences
b) decreased short fragment DNA sequences
c) the same number of short fragment DNA sequences
d) increasd long fragment DNA sequences
e) decreased long fragment DNA sequences - ANSWER: b) if E. coli DNA polymerase were used in
polymerase chain traction assays to amplify SSUrRNA gene sequences, we would expect to see
*decreased short fragment DNA sequences*.
Figure B1.1 (other side of card) represents an artist's attempt to illustrate the process of PCR. What is
the most significant error you notice in this figure?
a) DNA strands are not fully denatured
, b) Primers are not annealed
c) PCR products cannot separate from template DNA
d) Taq polymerase is not shown in the illustration
e) dNTPs are not shown in the illustration - ANSWER: a) *DNA strands are not fully denatured*
Select the answer choice with the correct order in which these structures evolved in plant cells:
a) mitochondria, cell walls, chloroplasts
b) mitochondria, chloroplasts, cell walls
c) chloroplasts, mitochondria, cell walls
d) chloroplasts, cell walls, mitochondria
e) cell walls, mitochondria, chloroplasts - ANSWER: b) The correct order in which structures evolved in
plant cells is: *mitrochondria -> chloroplats -> cell walls*
Approximately when did primitive cells first appear on Earth?
a) 1 billion years ago
b) 2 billion years ago
c) 2.5 billion years ago
d) 3 billion years ago
e) 3.8 billion years ago - ANSWER: e) primitive cells first appeared on Earth *3.8 billion years ago*
Which of these are fossilized microbial mats containing photosynthetic bacteria?
a) Stromatolites
b) Biofilms
c) Resin
d) Cyanobacteria
e) Stalagmites - ANSWER: a) *stromatolites* are fossilized microbial mats containing photosynthetic
bacteria
Which statement below is FALSE concerning the atmosphere of early earth?
a) The atmosphere was a reducing atmosphere.
b) Oxygen was present in very minute amounts.
c) Carbon dioxide was present in very minute amounts.
d) Hydrogen gas was present. - ANSWER: c) The atmosphere of early earth contained *carbon dioxide
present in high concentration, not very minute amounts*
The discovery of ribozymes provides evidence that life on the early Earth may have been based on:
a) DNA.
b) proteins.
c) RNA.
d) lipids.
e) polysaccharides. - ANSWER: c) the discovery of ribozymes provides evidence that life on the early
Earch may have been based on *RNA*
What is the Endosymbiotic Theory is used to explain?
a) the rapid evolution of viruses
b) antiphagocytic abilities of parasitic protozoa
c) emergence of cell walls
d) presence of mitochondria in eukaryotes
e) development of the nucleus in eukaryotes - ANSWER: d) the Endosymbiotic Theory is used to
explain *presence of mitochondria in eukaryotes*
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