Microbial antagonism is the
A. prevention of immune responses by the resident microbiota.
B. inhibition of T cell binding to microbes.
C. suppression of the complement cascade by microbes.
D. competition for nutrients, oxygen, and space between the resident microbiota and potential pathogens.
Answer: D
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The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum B. filtering bacterial food from the water C. directing currents away from the flagellum D. storing waste materials of the cell E. attaching to the substrate
The natural habitat of the bacterium Sphingobacterium is:
a. environment. b. animal oral and respiratory flora. c. environment, cold climates. d. human normal flora.
A ____ mechanism controls body temperature in the human body by reversing the body's attempt to generate heat
when body temperature rises.
a. positive feedback b. inhibition c. negative feedback d. cyclical feedback e. none of these
Which group is made up of almost exclusively decomposers?
A. Plants B. Fungi C. Animals D. Bacteria E. Protists