Which of the following compounds is produced and secreted by mast cells during an allergic reaction?
A) interferon
B) allergens
C) histamine
D) perforin
Answer: C
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From the surface to the interior of a tooth, the tissues in order are
A. enamel, dentin, and pulp. B. dentin, enamel, and pulp. C. dentin, pulp, and enamel. D. pulp, dentin, and enamel. E. enamel, pulp, and dentin.
Clownfish live within the tentacles of sea anemones. The anemone protects the fish from predators, and the clownfish cleans the anemone. This relationship is an example of
A) parasitism. B) predation. C) succession. D) mutualism. E) competition.
What anaerobic excavate protist, including diplomonads and parabasalids, have multiple flagella and no mitochondria?
A. Metamonads B. Phytoplankton C. Trypanosome D. Excavates E. Amoeba
In which of the following situations would you expect group selection to have the most influence on the course of evolutionary events?
A. Low between-group competition and low within-group competition B. Low between-group competition and high within-group competition. C. High between-group competition and low within-group competition. D. High between-group competition and high within-group competition.