High levels of antibodies in patients with SBE cause inflammation because
A.
they make the bacteria clump together and get trapped in skin and eyes.
B. the surface antigens change rapidly and become unrecognizable.
C. the antibodies are defective.
D. the antibodies degrade quickly.
A.
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Members of the ____ flatworm lineage are parasites of vertebrates, characterized by modified heads for attaching to
the intestinal wall of hosts, and a series of reproductive units called proglottids.
a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea
Which pigments reflect red, orange, and yellow light?
a. chlorophyll a b. phycocyanobilin c. phycoviolobilin d. carotenoids e. anthocyanin
The by-product of the metabolism of cyanobacteria
that had the most effect on the further evolution of life is a. oxygen gas. b. carbon dioxide. c. water. d. nitrogen gas. e. hydrogen gas.
Which statement is not a good explanation for the relatively low genetic variability among modern human populations?
A. There is greater variability within populations than among them. B. Human population size has increased drastically in a short period of time. C. Ancestral human population sizes were very small. D. Humans have a global geographic distribution. E. The level of inbreeding within human populations has been high at times.