A shared ancestral character is
A) a character that originated in an ancestor of two taxa.
B) shared by all mammals but not found in their ancestors.
C) an evolutionary novelty unique to a clade.
D) an outgroup character.
Answer: A) a character that originated in an ancestor of two taxa.
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Which eukaryotic organelle is associated with the breakdown of macromolecules?
A. endoplasmic reticulum B. Golgi apparatus C. mitochondria D. lysosome
What is the significance of the intersection of the prey isocline and the predator isocline?
a. The two isoclines intersect at the point of equilibrium where neither populationchanges size b. The two isoclines intersect at a point where one is increasing and the other isdecreasing. c. The two isoclines intersect when both populations are decreasing. d. The two isoclines intersect when both populations are increasing.
The largest lymphoid organ is the
a. spleen. b. tonsil. c. bone marrow. d. liver. e. thymus.
The chemical mediators of anaphylaxis are
A) found in basophils and mast cells. B) antibodies. C) antigens. D) antigen-antibody complexes. E) the proteins of the complement system.