In symbiotic associations between sulfur chemolithotrophs and eukaryotes such as tube worms and giant clams, the bacterial symbiont provides ________ while the host provides ________
A) nitrogen / carbon and oxygen
B) sulfide / oxygen
C) a carbon and energy source / stable sulfide and oxygen levels
D) organic acids / stable sulfate levels
Answer: C
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Isolates from an ear swab that are gram-negative coccobacilli grow on chocolate agar in CO2 but not blood agar, require both X and V factors for growth, and are nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. H. ducreyi. c. H. aphrophilus. d. H. influenzae.
Hormone leptin is produced by ____________________ cells.Fill in the blank(s) with the appropriate word(s)
The complement system consists of several proteins that form a(n) ________ that forms a pore in the membrane of bacteria during the nonspecific immune response.
A) membrane attack complex B) endogenous pyrogen C) perforin D) acute phase complex E) cell-mediated antigen
The Coriolis effect results in the:a
rising of air at the equator. b. falling of air near the poles. c. deflection of moving air due to the rotation of Earth. d. altitudinal variations in temperature.
e. release of heat once radiation strikes the Earth’s surface..