Microbiology Test #1 Chapter 1, Delgado Microbiology Ch 1-3
Test 1 , Microbiology Test #1 Chapter 2, Microbiology - Test
Bank, Microbiology Test #1 Chapter 3 With Questions And Well
Verified Answers Actual Exam!!! 2026
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 cell
The study of microbiology includes all of the following EXCEPT _____ .a) plants
b) viruses
c) bacteria
d) fungi
e) algae - ANSWER -a) plants
Which of these is an example of a macromolecule?a) an amino acid
b) a nucleoside
c) a protein
d) a purine
e) a a monosaccharide - ANSWER -c) a protein
Which one of the following is NOT a macromolecule?a) a protein
b) a polypeptide
c) DNA
d) mRNA
e) an amino acid - ANSWER -e) an amino acid
Which of these is the most abundant cellular macromolecule (on a dry weight basis)?a)
polypeptides.
,b) lipids.
c) DNA.
d) mRNA.
e) rRNA. - ANSWER -a) polypeptides.
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
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) Animals, Plants, and Protista - ANSWER -b) Bacteria, Archaea, and Eukarya
Which term represents the history of an organisms's evolution?
a) taxonomy
b) descent
c) classification
d) phylogeny
e) relative - ANSWER -d) phylogeny
Viruses are considered "nonliving" for all of the following reasons EXCEPTa) 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) possess DNA that can
evolve.
,In the study of which of these fields have unicellular microbes played an important role?a)
biochemical pathways
b) protein synthesis
c) DNA replication
d) mRNA synthesis
e) all of the above - ANSWER -e) all of the above
Which of these are fossilized microbial mats containing photosynthetic bacteria? -
ANSWER -a) Stromatolites
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.
e) Nitrogen gas was presentin very large amounts. - ANSWER -c) Carbon dioxide was
present in very minute amounts.
The discovery of ribozymes provide evidence that life on the early Earth may have been based
on:
a) DNA.
b) proteins.
c) RNA.
d) lipids.
e) polysaccharides. - ANSWER -c) RNA.
What is the Endosymbiotic Theory is used to explain?
a) the rapid evolution of viruses
b) antiphagocytic abilities of parasitic protozoa
c) pathogenicity of parasitic bacteria
, d) presence of mitochondria in eukaryotes
e) development of the nucleus in eukaryotes - ANSWER -d) presence of mitochondria in
eukaryotes
What is a progenote?
a) a type of Bacteria
b) a type of Archaea
c) a type of Bacteria or Archaea
d) an early type of mitochondrion
e) the earliest form of cellular life - ANSWER -e) the earliest form of cellular life
What is the he most prolific source of genetic variation in living organisms?
a) mutation
b) mitosis
c) transcription
d) translation
e) viral insertion - ANSWER -a) mutation
Which of these best describes horizontal gene transfer?
a) mitosis followed by cytokinesis
b) meiosis and subsequent formation of a zygote
c) transfer of genes from mother cell to daughter cell
d) DNA replication followed by crossing over
e) acquisition of genes from another organism in the same generation - ANSWER -e)
acquisition of genes from another organism in the same generation
Which is the correct distinction between a heterotroph and an autotroph?
a) An autotroph utilizes organic compounds as a carbon source and a heterotroph uses carbon
dioxide as a carbon source.
b) An autotroph utilizes carbon dioxide as a carbon source and a heterotroph utilizes organic
compounds as a carbon source.
c) An autotroph utilizes complex organic compounds as a carbon source and a heterotroph
utilizes simple organic compounds as a carbon source.
Test 1 , Microbiology Test #1 Chapter 2, Microbiology - Test
Bank, Microbiology Test #1 Chapter 3 With Questions And Well
Verified Answers Actual Exam!!! 2026
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 cell
The study of microbiology includes all of the following EXCEPT _____ .a) plants
b) viruses
c) bacteria
d) fungi
e) algae - ANSWER -a) plants
Which of these is an example of a macromolecule?a) an amino acid
b) a nucleoside
c) a protein
d) a purine
e) a a monosaccharide - ANSWER -c) a protein
Which one of the following is NOT a macromolecule?a) a protein
b) a polypeptide
c) DNA
d) mRNA
e) an amino acid - ANSWER -e) an amino acid
Which of these is the most abundant cellular macromolecule (on a dry weight basis)?a)
polypeptides.
,b) lipids.
c) DNA.
d) mRNA.
e) rRNA. - ANSWER -a) polypeptides.
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
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) Animals, Plants, and Protista - ANSWER -b) Bacteria, Archaea, and Eukarya
Which term represents the history of an organisms's evolution?
a) taxonomy
b) descent
c) classification
d) phylogeny
e) relative - ANSWER -d) phylogeny
Viruses are considered "nonliving" for all of the following reasons EXCEPTa) 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) possess DNA that can
evolve.
,In the study of which of these fields have unicellular microbes played an important role?a)
biochemical pathways
b) protein synthesis
c) DNA replication
d) mRNA synthesis
e) all of the above - ANSWER -e) all of the above
Which of these are fossilized microbial mats containing photosynthetic bacteria? -
ANSWER -a) Stromatolites
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.
e) Nitrogen gas was presentin very large amounts. - ANSWER -c) Carbon dioxide was
present in very minute amounts.
The discovery of ribozymes provide evidence that life on the early Earth may have been based
on:
a) DNA.
b) proteins.
c) RNA.
d) lipids.
e) polysaccharides. - ANSWER -c) RNA.
What is the Endosymbiotic Theory is used to explain?
a) the rapid evolution of viruses
b) antiphagocytic abilities of parasitic protozoa
c) pathogenicity of parasitic bacteria
, d) presence of mitochondria in eukaryotes
e) development of the nucleus in eukaryotes - ANSWER -d) presence of mitochondria in
eukaryotes
What is a progenote?
a) a type of Bacteria
b) a type of Archaea
c) a type of Bacteria or Archaea
d) an early type of mitochondrion
e) the earliest form of cellular life - ANSWER -e) the earliest form of cellular life
What is the he most prolific source of genetic variation in living organisms?
a) mutation
b) mitosis
c) transcription
d) translation
e) viral insertion - ANSWER -a) mutation
Which of these best describes horizontal gene transfer?
a) mitosis followed by cytokinesis
b) meiosis and subsequent formation of a zygote
c) transfer of genes from mother cell to daughter cell
d) DNA replication followed by crossing over
e) acquisition of genes from another organism in the same generation - ANSWER -e)
acquisition of genes from another organism in the same generation
Which is the correct distinction between a heterotroph and an autotroph?
a) An autotroph utilizes organic compounds as a carbon source and a heterotroph uses carbon
dioxide as a carbon source.
b) An autotroph utilizes carbon dioxide as a carbon source and a heterotroph utilizes organic
compounds as a carbon source.
c) An autotroph utilizes complex organic compounds as a carbon source and a heterotroph
utilizes simple organic compounds as a carbon source.
