Microbiology - Module 6 (EXAM 3 Material) Questions With Complete Solutions
Which statement regarding symbiosis is false?
Multiple choice question.
Symbiotic associations typically have a negative impact on one of the species involved.
Shifting environmental conditions may impact the benefit or harm of a symbiotic interaction.
Symbiosis refers to stable associations of one organism with another. - (ANSWER)Symbiotic associations
typically have a negative impact on one of the species involved.
Which statement regarding the interaction of a temperate bacteriophage and its host bacteria is false?
Multiple choice question.
The outcome of a lytic infection is always negative for the temperate bacteriophage.
The decision of whether an infection will be lytic or lysogenic is determined by environmental factors.
The outcome of a lytic infection is always negative for the host bacterial cell. - (ANSWER)The outcome of
a lytic infection is always negative for the temperate bacteriophage.
Which statement regarding syntrophy is false?
Multiple choice question.
Syntrophy occurs when one species benefits from the metabolic products of another.
The majority of microbial interactions between free-living organisms in marine habitats are syntrophic.
The flow of nutrients from heterotrophs to autotrophs is an example of syntrophy. - (ANSWER)The flow
of nutrients from heterotrophs to autotrophs is an example of syntrophy.
In mutualistic associations between microbes and insects, the microbe generally receives ______.
Multiple choice question.
sulfate for use as an electron acceptor
secure habitat and ample nutrients
essential vitamins and amino acids
a steady supply of cellulose - (ANSWER)secure habitat and ample nutrients
A mature aphid contains millions of Buchnera aphidicola cells, located ______.
,Microbiology - Module 6 (EXAM 3 Material) Questions With Complete Solutions
Multiple choice question.
within specialized cells called bacteriocytes
on the surface of the insect as ectosymbionts
throughout the insect body as endosymbionts - (ANSWER)within specialized cells called bacteriocytes
The stable association of one organism with another is called _______ regardless of the outcome. -
(ANSWER)Symbiosis
If an aphid is treated with an antibiotic, it dies. Which is the best explanation for this observation?
Multiple choice question.
Bacteria living in aphids become pathogenic upon exposure to antibiotics.
Aphid cells convert antibiotics to toxins.
Aphid cells are susceptible to antibiotics.
Aphids harbor obligate mutualistic bacteria. - (ANSWER)Aphids harbor obligate mutualistic bacteria.
A bacteriophage that infects a bacterial cell and becomes lysogenic may be beneficial for the host
bacterium when ______.
Multiple choice question.
the bacteriophage becomes defective and cannot excise from the chromosome
its genes are not already present in the host CRISPR repeats
nutrients are limited
the bacteriophage carries genes that expand the cell's metabolism - (ANSWER)the bacteriophage carries
genes that expand the cell's metabolism
Which observation supports the idea that endosymbiotic relationships between aphids and Buchnera
species are evolutionarily old?
Multiple choice question.
-The bacteria have acquired new genes and new traits over time.
-In amino acid biosynthetic pathways, certain steps occur in only the aphid or the endosymbiont.
, Microbiology - Module 6 (EXAM 3 Material) Questions With Complete Solutions
-The genomes of the bacterial endosymbionts are relatively large. - (ANSWER)In amino acid biosynthetic
pathways, certain steps occur in only the aphid or the endosymbiont.
A symbiotic association in which one species benefits from the metabolic products of another is called
______.
Multiple choice question.
heterotrophy
auxotrophy
predation
syntrophy - (ANSWER)syntrophy
Termites are aided in the digestion of wood by ______ that complete lignocellulose degradation and by
______ that fix atmospheric nitrogen.
Multiple choice question.
protists / archaea
bacteria / archaea
protists / bacteria
archaea / bacteria - (ANSWER)protists / bacteria
Mutualistic relationships between microbes and insects are common because insects ______.
Multiple choice question.
lack a digestive tract, and therefore rely on endosymbionts for carbon
often consume diets lacking essential nutrients
lack any immune defenses, and therefore rely on microbes for this function
require additional energy to support high levels of activity - (ANSWER)often consume diets lacking
essential nutrients
Protists convert the cellulose derived from a termite's wood diet to its preferred carbon source, acetate,
through the process of ______.
Which statement regarding symbiosis is false?
Multiple choice question.
Symbiotic associations typically have a negative impact on one of the species involved.
Shifting environmental conditions may impact the benefit or harm of a symbiotic interaction.
Symbiosis refers to stable associations of one organism with another. - (ANSWER)Symbiotic associations
typically have a negative impact on one of the species involved.
Which statement regarding the interaction of a temperate bacteriophage and its host bacteria is false?
Multiple choice question.
The outcome of a lytic infection is always negative for the temperate bacteriophage.
The decision of whether an infection will be lytic or lysogenic is determined by environmental factors.
The outcome of a lytic infection is always negative for the host bacterial cell. - (ANSWER)The outcome of
a lytic infection is always negative for the temperate bacteriophage.
Which statement regarding syntrophy is false?
Multiple choice question.
Syntrophy occurs when one species benefits from the metabolic products of another.
The majority of microbial interactions between free-living organisms in marine habitats are syntrophic.
The flow of nutrients from heterotrophs to autotrophs is an example of syntrophy. - (ANSWER)The flow
of nutrients from heterotrophs to autotrophs is an example of syntrophy.
In mutualistic associations between microbes and insects, the microbe generally receives ______.
Multiple choice question.
sulfate for use as an electron acceptor
secure habitat and ample nutrients
essential vitamins and amino acids
a steady supply of cellulose - (ANSWER)secure habitat and ample nutrients
A mature aphid contains millions of Buchnera aphidicola cells, located ______.
,Microbiology - Module 6 (EXAM 3 Material) Questions With Complete Solutions
Multiple choice question.
within specialized cells called bacteriocytes
on the surface of the insect as ectosymbionts
throughout the insect body as endosymbionts - (ANSWER)within specialized cells called bacteriocytes
The stable association of one organism with another is called _______ regardless of the outcome. -
(ANSWER)Symbiosis
If an aphid is treated with an antibiotic, it dies. Which is the best explanation for this observation?
Multiple choice question.
Bacteria living in aphids become pathogenic upon exposure to antibiotics.
Aphid cells convert antibiotics to toxins.
Aphid cells are susceptible to antibiotics.
Aphids harbor obligate mutualistic bacteria. - (ANSWER)Aphids harbor obligate mutualistic bacteria.
A bacteriophage that infects a bacterial cell and becomes lysogenic may be beneficial for the host
bacterium when ______.
Multiple choice question.
the bacteriophage becomes defective and cannot excise from the chromosome
its genes are not already present in the host CRISPR repeats
nutrients are limited
the bacteriophage carries genes that expand the cell's metabolism - (ANSWER)the bacteriophage carries
genes that expand the cell's metabolism
Which observation supports the idea that endosymbiotic relationships between aphids and Buchnera
species are evolutionarily old?
Multiple choice question.
-The bacteria have acquired new genes and new traits over time.
-In amino acid biosynthetic pathways, certain steps occur in only the aphid or the endosymbiont.
, Microbiology - Module 6 (EXAM 3 Material) Questions With Complete Solutions
-The genomes of the bacterial endosymbionts are relatively large. - (ANSWER)In amino acid biosynthetic
pathways, certain steps occur in only the aphid or the endosymbiont.
A symbiotic association in which one species benefits from the metabolic products of another is called
______.
Multiple choice question.
heterotrophy
auxotrophy
predation
syntrophy - (ANSWER)syntrophy
Termites are aided in the digestion of wood by ______ that complete lignocellulose degradation and by
______ that fix atmospheric nitrogen.
Multiple choice question.
protists / archaea
bacteria / archaea
protists / bacteria
archaea / bacteria - (ANSWER)protists / bacteria
Mutualistic relationships between microbes and insects are common because insects ______.
Multiple choice question.
lack a digestive tract, and therefore rely on endosymbionts for carbon
often consume diets lacking essential nutrients
lack any immune defenses, and therefore rely on microbes for this function
require additional energy to support high levels of activity - (ANSWER)often consume diets lacking
essential nutrients
Protists convert the cellulose derived from a termite's wood diet to its preferred carbon source, acetate,
through the process of ______.
