Chemical signals that convey information among members of a species are known as
A. hormones.
B. pheromones.
C. acoustical signals.
D. threat signals.
E. auditory signal.
Answer: B
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Isolates from cerebrospinal fluid (CSF) or respiratory tract specimens that are gram-negative coccobacilli grow on chocolate agar in CO2 but not on blood agar, and are porphyrin-negative and nonhemolytic on rabbit or horse blood may be identified as:
a. H. parainfluenzae. b. Haemophilus parahaemolyticus. c. H. haemolyticus. d. H. influenzae.
Genetic drift affects a large population more than a small population
a. true b. false
A viral shape that isn't classified as purely helical or icosahedral is referred to as:
a. Capsid b. Simple c. Prolate d. Enveloped e. Complex
Na+ ion concentrations are higher outside the cell than inside the cell. What type of transport system is required to move Na+ ions in and out of the cell?
A. Na+ moves into the cell by facilitated diffusion and can not move out of the cell B. Na+ moves in and out of the cell by active transport C. Na+ moves into the cell by facilitated diffusion and out of the cell by active transport D. Na+ moves in and out of the cell by passive diffusion E. Na+ moves into the cell by active transport and out of the cell by facilitated diffusion