Autoimmune disorders are characterized by immune destruction of self tissues. The underlying basis of these disorders is
A. an overproduction of complement.
B. lack of an anamnestic response.
C. an oversecretion of antibodies from memory B cells.
D. a lack of immune tolerance.
Answer: D
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Which of the following is a characteristic of tundra?
A. temperate climate B. permafrost C. more than 100 cm of rain a year D. deciduous forests E. high biodiversity
In the figure above, representing transcription, the item labeled "C" is
a. the nontemplate strand. b. RNA-DNA hybrid. c. the template strand. d. DNA double helix. e. the RNA copy.
What fleshy projection is an adaptation some fish have to lure prey in?
a. Barbel b. Antennae c. Photophore d. Appendage
Secretory IgA act protects the mucous membranes by:
A. Acting as an opsonin (a substance that mark the target for phagocytosis) B. Activating the helper T-cells C. Interfering with the adherence of the microbe to the mucous membrane D. Killing the invading microbe