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

Biology & Microbiology

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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

Biology & Microbiology

Gap junctions in plant cells can close

a. true b. false

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology