MICROBIOLOGY MODULE 6 EXAM 2026
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
◉ 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 ______.
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?
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
◉ 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 ______.
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?
