Which set of steps best accounts for the role of the axon hillock in nerve cell activity?
A. depolarization, summation, threshold,
action potential
B. threshold, refractory period, depolarization,
action potential
C. threshold, action potential, refractory
period, summation
D. summation, refractory period, threshold,
action potential
A
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Countercurrent exchange allows for the removal of ____ percent of O2 from water flowing over gills
a. 50?60 b. 60?70 c. 70?80 d. 80?90 e. 90?100
According to the modern synthetic theory of evolution, the accumulation of mutations over time
results in
a. microevolution. b. adaptation. c. an increase in genetic variation. d. speciation. e. macroevolution.
___________, or water bears, have a reduced coelom
and molt. Fill in the blank(s) with the appropriate word(s).
Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
A. N-acetylglucosamine B. peptidoglycan C. lipoteichoic acid D. endotoxin E. mycolic acid