_______ structures are those that have no obvious function at the present time but are believed to be "leftovers" from an ancestor that did use that part.
a) vestigal
b) adaptive
c) analogous
d) homologous
Ans: a) vestigal
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When rapid speciation produces a cluster of closely related species that occupy different habitats or consume different
foods, the process is referred to as ____.
a. punctuated equilibrium b. disjunct dispersal c. disjunct vicariance d. adaptive radiation e. continuous vicariance
Movement of substances that requires the expenditure of ATP molecules is called ____
a. facilitated diffusion b. simple diffusion c. osmosis d. active transport e. bulk flow
The nerves are the organs of the ___________ nervous system.
Fill in the blank(s) with the appropriate word.
If a T cell is exposed to a "hidden" antigen, what kind of immune reaction will result?
A. an autoimmune disease B. a delayed hypersensitivity reaction C. a cytotoxic hypersensitivity reaction D. allergic contact dermatitis E. an allergy