The period in which an axon membrane cannot act is called __________.
A) saltatory conduction
B) depolarization
C) the refractory period
D) a resting potential
E) an action potential
Answer: C) the refractory period
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Guard cells control their volume, and thus size:
A. by increasing the amount of solutes such as K+ and Cl-. B. by reducing the amount of solutes such as K+ and Cl-. C. by increasing the amount of water in the cells without changing solute concentration. D. by decreasing the amount of water in the cells without changing solute concentration. E. by increasing the amount of CO2 in the cells.
Geographic isolates of a particular species that differ from other populations by one or more characteristics are considered to be
A) clines. B) subspecies. C) evolutionary "dead ends." D) ecotypes.
Ergot, a fungus, contains a hallucinogenic drug that binds to serotonin receptors. The natural drug is most similar to ________
A) mescaline B) methamphetamine C) LSD D) morphine
Functions of the smooth endoplasmic reticulum include ________
A) steroid synthesis, protein synthesis, and drug detoxification B) lipid synthesis, protein synthesis, and drug detoxification C) lipid synthesis, steroid synthesis, and drug detoxification D) lipid synthesis, steroid synthesis, and storage of genetic information