Histamine, serotonin, and bradykinin are all
A. vasoactive mediators.
B. mediators that increase chemotaxis.
C. mediators of T-cell activity.
D. fever inducers.
E. mediators of B-cell activity.
Answer: A
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Metagenomic studies of prokaryotes have
revealed that
a. there is very little diversity among bacteria. b. archaea are more closely related to bacteria than to eukaryotes. c. bacteria and archaea are essentially the same organisms. d. most archaea evolved from viruses. e. none of these things were revealed by metagenomic studies
Example: Temperature Response
What will be an ideal response?
A map unit (?) is
A) the position of a gene on the chromosome. B) the unit of genetic distance on a chromosome. C) the unit of physical distance on a chromosome. D) equivalent to a nucleotide. E) equal to the number of recombinant progeny.
Large amounts of oxygen gas appeared in Earth's atmosphere about ________ years ago
A) 200 million B) 1.7 billion C) 2.7 billion D) 4.5 billion