OPENSTAX MICROBIOLOGY 2026 PRACTICE
TEST SHEET FULL SOLUTIONS CORRECT
ANSWERS GUARANTEED PASS
◉ Bioremediation.
Answer: Because of their wide metabolic capabilities prokaryotes
can be useful in removing harmful substances from the environment
(oil, PCBs, plastics, etc.
◉ Pathogenic.
Answer: Some are capable of causing illness or infection once inside
the body
◉ climate change.
Answer: May be involved in climate change -melting of permafrost
and production of greenhouse gases.
◉ Halophiles.
Answer: Some prokaryotes, called halophiles, can thrive in
extremely salty environments such as the Dead Sea, pictured
here.(b)The archaeon Halobacterium salinarum, shown here in an
electron micrograph, is a halophile that lives in the Dead Sea.
,◉ Halobacterium salinarum.
Answer: halophile that lives in the dead sea
◉ Nitrogen-fixing bacteria.
Answer: Nitrogen-fixing bacteria such as Rhizobiumlive in the root
nodules of legumes such as clover.(b)This micrograph of the root
nodule shows bacteroids (bacterium-like cells or modified bacterial
cells) within the plant cells. The bacteroids are visible as darker
ovals within the larger plant cell.
◉ Legionella.
Answer: the bacterium responsible for causing Legionnaire's disease
◉ community.
Answer: Prokaryotes are part of a group of interacting populations
of organisms.u
◉ population.
Answer: Group of individual organisms belonging to the same
biological species and limited to a certain geographical area
◉ cooperative interactions.
Answer: interactions between populations that are beneficial
, ◉ competitive interactions.
Answer: Competition for resources between populations.
◉ symbiosis.
Answer: Interaction between two different organisms (species)
living in close physical association, typically (but not always) to the
advantage of both
◉ mutualism.
Answer: The interaction is beneficial for both organisms
◉ amensalism.
Answer: The interaction HARMS one organism and has NO EFFECT
on the other
◉ commensalism.
Answer: The interaction BENEFITS one organism and has NO
EFFECT on the other
◉ neutralism.
Answer: The interaction has NO EFFECT on both organisms
TEST SHEET FULL SOLUTIONS CORRECT
ANSWERS GUARANTEED PASS
◉ Bioremediation.
Answer: Because of their wide metabolic capabilities prokaryotes
can be useful in removing harmful substances from the environment
(oil, PCBs, plastics, etc.
◉ Pathogenic.
Answer: Some are capable of causing illness or infection once inside
the body
◉ climate change.
Answer: May be involved in climate change -melting of permafrost
and production of greenhouse gases.
◉ Halophiles.
Answer: Some prokaryotes, called halophiles, can thrive in
extremely salty environments such as the Dead Sea, pictured
here.(b)The archaeon Halobacterium salinarum, shown here in an
electron micrograph, is a halophile that lives in the Dead Sea.
,◉ Halobacterium salinarum.
Answer: halophile that lives in the dead sea
◉ Nitrogen-fixing bacteria.
Answer: Nitrogen-fixing bacteria such as Rhizobiumlive in the root
nodules of legumes such as clover.(b)This micrograph of the root
nodule shows bacteroids (bacterium-like cells or modified bacterial
cells) within the plant cells. The bacteroids are visible as darker
ovals within the larger plant cell.
◉ Legionella.
Answer: the bacterium responsible for causing Legionnaire's disease
◉ community.
Answer: Prokaryotes are part of a group of interacting populations
of organisms.u
◉ population.
Answer: Group of individual organisms belonging to the same
biological species and limited to a certain geographical area
◉ cooperative interactions.
Answer: interactions between populations that are beneficial
, ◉ competitive interactions.
Answer: Competition for resources between populations.
◉ symbiosis.
Answer: Interaction between two different organisms (species)
living in close physical association, typically (but not always) to the
advantage of both
◉ mutualism.
Answer: The interaction is beneficial for both organisms
◉ amensalism.
Answer: The interaction HARMS one organism and has NO EFFECT
on the other
◉ commensalism.
Answer: The interaction BENEFITS one organism and has NO
EFFECT on the other
◉ neutralism.
Answer: The interaction has NO EFFECT on both organisms
