Bacteroids are rarely found within plant cells. (True or false?)

Bacteroids are rarely found within plant cells.
 
  Indicate whether the statement is true or false.

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Biofilms in the human mouth primarily contain pathogens.
 
  Indicate whether the statement is true or false.

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The human oral flora consists of
 
  A) a small group of phylogenetically related aerobic microorganisms.
  B) diverse aerobic and anaerobic microorganisms.
  C) monoculture biofilms on tooth surfaces.
  D) the same phyla that are found in the human gut.

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Why was Escherichia coli thought to be a dominant member of the human gut microbial community in the past? What populations ARE important in the human gut and what evidence do we have that the specific bacteria present are important for human health?
 
  What will be an ideal response?

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In mycorrhizal mutualisms between plants roots and fungi,
 
  A) the plant supplies carbohydrates to the fungus and the fungus supplies phosphorus and nitrogen to the plant.
  B) the plant supplies water to the fungus and the fungus supplies essential amino acids to the plant.
  C) the plant protects the fungus from predation and the fungus supplies carbohydrates to the plant.
  D) the fungus infects the plant roots, stimulating plant growth through myc factors that act as growth hormones in the plant.