What limits the frequency of action potentials?
A. chloride ions
B. spike amplitude
C. nodes of Ranvier
D. refractory period
D. refractory period
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The energy needed to destabilize existing chemical bonds and start a chemical reaction is called
A. activation energy B. free energy C. kinetic energy D. potential energy
High-energy electrons from molecules of NADH and FADH2 are transferred to a chain of proteins within the electron transport chain. What is the final electron acceptor of the electron transport chain?
A. carbon dioxide B. oxygen C. cytochrome c D. ubiquinone E. NAD+
Molecular techniques have shown that Cyanobacteria are not present in soil.
Answer the following statement true (T) or false (F)
Place the layers of a mammalian gut in order from outside inward, toward the lumen
a. mucosa ? submucosa ? muscularis ? serosa b. muscularis ? mucosa ? submucosa ? serosa c. serosa ? muscularis ? submucosa ? mucosa d. serosa ? mucosa ? submucosa ? muscularis e. serosa ? submucosa ? mucosa ? muscularis