The structure(s) critical to the function of a chemical synapse include
_____ gap junctions.
_____ neurotransmitters.
_____ vesicles.
_____ voltage-gated Ca2+ channels.
_____ electrical signals.
_____ gap junctions.
__X__ neurotransmitters.
__X__ vesicles.
__X__ voltage-gated Ca2+ channels.
_____ electrical signals.
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An endemic species is one that
A. has been cultivated by humans. B. functions as a keystone species. C. is found in only one particular place or region. D. can be used as an indicator species. E. does not effect ecosystem function.
The carbon source for saprobes is dead organic material
a. True b. False
Small groups of individuals leave their home population and establish new settlements, mating only among themselves, are referred to as the
A. founder effect. B. bottleneck effect. C. artificial effect. D. natural effect. E. migration effect.
Which one of the following statements about the phylum Brachiopoda is false?
A. As in bivalves, the valves in brachiopods are lateral (left and right) to the body axis. B. The lophophore resides within the brachiopod's shells. C. Brachiopods were much more diverse in the past. D. Most brachiopods are sessile (attached). E. Brachiopods are often misidentified as bivalves.