The brain reward system _____
A) represents an emergent brain property that has arisen independent of natural selection
B) is a reflex of the peripheral nervous primarily under autonomic control
C) is housed in the thalamus and primarily regulates the enteric division of the autonomic nervous system
D) utilizes the neurotransmitter dopamine and is affected by drug addiction
D
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The most common leukocyte in the blood is
(a) a lymphocyte. (b) an eosinophil. (c) a basophil. (d) a neutrophil.
Four of the following are chelicerates. Which one is the exception?
a. Tick b. mosquito c. spider d. horseshoe crab e. scorpion
The blastocyst begins to form a second hollow cavity that will eventually become the
A) placenta. B) fundus. C) amniotic cavity. D) embryonic disk. E) embryo.
Which statement is TRUE of methanogenic and extremely halophilic Archaea?
A) The methanogens are obligate aerobes; the extreme halophiles are obligate anaerobes. B) The methanogens are obligate anaerobes; the extreme halophiles are mostly obligate aerobes. C) Both the methanogens and the extreme halophiles are obligate aerobes. D) Both the methanogens and the extreme halophiles are obligate anaerobes.