Microbiolgy quiz Why would a luminescent bacterium be nonluminescent when free i
ID: 45945 • Letter: M
Question
Microbiolgy quiz
Why would a luminescent bacterium be nonluminescent when free in seawater?
The O2 concentration is too low for luminscence.
There is not enough long-chain aldehyde.
Autoinducer does not accumulate.
It requires hemoglobin from the fish.
Why do animals establish relationships with luminescent bacteria?
mating
schooling
attracting prey
protection
all of the above
The endosymbionts that enable Riftia to survive in the harsh environment around hydrothermal vents are found in the
the gills
the plume
the sheath
the trophosome
Leghomoglobin is described as a truly symbiotic enzyme because
it carries oxygen from the plant to the bacterium.
the protein component comes from the plant and the heme component comes from the bacterium.
the protein component comes from the bacterium and the heme component comes from the plant
leghemoglobin is used to attract bacteria to the roothairs of the plant.
Organisms that do not survive in the absence of a partner are called
mutualistic partners
symbiotic partners
obligate symbionts.
antagonistic partners
parasitic partners.
All of the following can be attributed to beneficial symbiotic associations except
nutrition
protection
access to new habitats.
recognition aids.
All of the above are attributes of benefical symbiotic associations.
An example of a beneficial relationship that allows an organism to have access to a new habitat is
lichens
Ectomycorrhizae
Rhizobium-legume.
Klebsiella-leaf
In newborn mammals, the distinct microbiota in their digestive tract is
directly transmitted from the mother to her newborn just before birth
slowly transmitted from the mother to her fetus during gestation.
gained slowly following birth from their diet and interaction with adults.
gained quickly following birth from their diet.
None of the above
A cooperative interaction in which two or more organisms combine to synthesize a required growth factor or to catabolize a substrate, which neither could utilize independently, or to exchange nutrients, is called
a consortium
mutualism
commensalism
None of the above
Ruminants obtain amino acids and vitamins from digestion of
grain
protein
grass
bacteria
bacteria and plant material degraded first in the rumen
Explanation / Answer
1. there is not enough long chain aldehyde.
2. attracting prey.
3. trophosome.
4. heme produced by the bacterium and protein by plant .
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