The complement pathway that requires antibodies to be activated is the
A. alternate pathway.
B. classical pathway.
C. properdin pathway.
D. inflammatory pathway.
B
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The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. amino acids. B. gases such as nitric oxide. C. neuropeptides. D. biogenic amines. E. acetylcholine.
A Norfolk chicken has feathers that have an overall gray appearance, but if you look at an
individual feather, it is either black or white. Feather color in these birds is expressed as __________.
a. codominance b. incomplete dominance c. sex-linked d. pleiotropy
The iron meteorites
a. never fall on the Earth. b. are only found in the Antarctic. c. are composed of carbonaceous chondrites. d. are responsible for most of the meteor craters on the surface of the moon. e. appear to have formed in the interiors of molten planetesimals.
Which of the following is the primary assumption made by researchers when designing experiments to
model how life may have arisen?
a. The chemical reactions of living things are only possible in living systems. b. Living organisms are composed of elements commonly found in the universe and on Earth. c. Conditions on Earth have not changed over time. d. Life arose on Earth from non-living matter. e. The development of living cells from nonliving matter was very rapid.