Reef-building polyps get their sugars from mutualistic ____
a. green algae
b. cyanobacteria
c. dinoflagellates
d. roundworms
e. planarians
ANSWER: c
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An ________ of a nerve cell is the temporary depolarization and repolarization of the cell membrane.
Fill in the blank(s) with the appropriate word(s).
What contributes to muscle fatigue?
a. lactic acid buildup b. glycogen depletion c. both lactic acid buildup and glycogen depletion d. loss of nerve innervation e. stretching a muscle
Figure 53-6 represents the age structure diagram of:
a. the transition stage. b. the preindustrial state. c. a moderately developed country. d. a developing country. e. a highly developed country.
The minimum sterilizing conditions in a steam autoclave are
A. 160°C for 2 hours. B. 100°C for 30 minutes. C. 63°C for 30 minutes. D. 71.6°C for 15 seconds. E. 121°C at 15 psi for 15 minutes.