Cultures taken from an impetigo lesion reveal bacteria that are Gram-positive cocci which are catalase- and coagulase-negative and cause beta-hemolysis when cultured on blood agar. The responsible species is
A) Staphylococcus aureus.
B) staphylococci species other than Staphylococcus aureus.
C) Streptococcus pyogenes.
D) Pseudomonas aeruginosa.
E) Clostridium perfringens.
Answer: C
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Indicate whether the statement is true or false.
Chaparral is
A. restricted to serpentine soils. B. widespread in Africa. C. a type of shrubland/grassland. D. a type of forest. E. distinguished by tall trees.
What role do chloride cells play in osmoregulation of marine fish with bony skeletons?
A) They actively transport chloride into the gills. B) They mediate the movement of salt from seawater through their gills. C) They are involved in excretion of excess salt. D) They actively transport salt across the basolateral membrane of the rectal gland.
An enzyme maintains a rigid structure while catalyzing a reaction.
a. true b. false