Which of the following statements about action potentials is false?
A) Electrical signals are propagated along a dendrite.
B) They require rapid changes in membrane potential.
C) Due to leaking, membranes are subject to subthreshold depolarization, which is insufficient to produce the action potential.
D) At the end of the action potential, most neurons show a transient hyperpolarization.
E) A refractory period is always necessary following an action potential.
A) Electrical signals are propagated along a dendrite.
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When the squid that contain luminescent bacterial symbionts hatch, they do NOT contain a bacterial symbiont. Symbiont transmission in this symbiosis is
A) vertical from parent to offspring. B) horizontal and involves specific selection of the symbiont from the environment. C) random and results in various different species being selected as the symbiont. D) mixed and results in multiple symbiont species colonizing the squid at once.
Ammonia, urea, and uric acid
A. are all nitrogenous wastes. B. all require large amounts of water for excretion. C. all require about the same amount of energy to produce. D. are all equally toxic. E. are all produced by the kidney.
The taxon that is composed of similar species that have several important features in common but differ sufficiently to still maintain their status as individual species is which one of the fol-lowing?
a. Class b. Order c. Family d. Genus
The use of ____________________ or ____________________ for stem cell therapies offers alternatives to the
destruction of human embryos that occurs when embryonic stem cells are harvested. Fill in the blank(s) with the appropriate word(s).