Signaling by neurotransmitters is an example of _______ signaling.
a. autocrine
b. endocrine
c. paracrine
d. direct cell-to-cell
Ans: c. paracrine
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Place the following events in the order in which they occur for chemical synapse transmission
(1) Ca2+ enters axon terminal. (2) Ligand-gated ion channels open in postsynaptic membrane. (3) Neurotransmitter binds to postsynaptic receptor. (4) Action potential reaches axon terminal of presynaptic neuron. (5) Neurotransmitter released by exocytosis.
a. 4, 1, 5, 3, 2 b. 4, 3, 1, 5, 2 c. 4, 5, 1, 3, 2 d. 4, 1, 3, 5, 2 e. 4, 5, 2, 3, 1
As part of observation in your scientific method, you discover that your strawberry plants are producing plantlets that are identical to the parent plant. This demonstrates that they reproduce by
A. development and maturation. B. fragmentation. C. development and adaptation. D. sexual reproduction. E. asexual reproduction.
Mushrooms that we eat are technically referred to as:
a. basidiospores. b. basidiocarps. c. myceliae. d. hyphae. e. gills.
A cnidarian that builds a calcium carbonate skeleton is a(n)
A) crab. B) snail. C) clam. D) oyster. E) coral.