Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse
If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi) to a synapse, what would you expect to happen? A) paralysis of muscle tissue
B) convulsions due to constant muscle stimulation
C) decrease in the frequency of action potentials
D) no effect
B
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Which type of chemical linkage is the weakest?
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
The study of interactions among organisms and between organisms and their environment is known as ____
a. environmentalism b. demography c. ecology d. biogeography e. paleontology
The "Age of Fishes" is an informal name for the:a
Ordovician period. b. Silurian period. c. Devonian period. d. Permian period. e. Carboniferous period.
The diploid number for the tomato, a eudicot, is 24. One of its pollen grains has ________ chromosomes, and the nutritive tissue of the seed has ________ chromosomes
A) 12… 12 B) 12… 24 C) 24… 24 D) 24… 36