Which local regulator is stored in cells of the immune system and released during an allergic reaction?
a. histamine
b. nitric oxide
c. a growth factor
d. a prostaglandin
e. a neurotransmitter
a
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Biotic potential ____
a. can always be reached in the natural world b. is independent of life history traits c. is based on limited resources d. would be indicated by an S-shaped curve e. is a theoretical value based on conditions of unlimited resources
Gap junctions in plant cells can close
a. true b. false
The wide variation in skin color in humans is best explained by
a. environmental changes like improvements in diet. b. genetic drift. c. skin color is a polygenic trait. d. crossing over. e. artificial selection.
Considering the Avery et al experiments, which of the following would have been the appropriate control experiment(s) to support their conclusions?
A: Addition of plain growth medium without heat-killed S cells to the R cells. B: Addition of heat-killed S cell filtrate that had not been treated with any enzymes C: Addition of DNAse-treated heat-killed R-cells to S cells. D: A and B E: All of the above.