Which model would predict that populations diverge from one another through the slow accumulation
of adaptive changes within each population?
a. punctuated equilibrium
b. paedomorphosis
c. hybridization
d. gradualism
e. allopolyploidy
D
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The most effective level of defense against pathogens is the ____ immune system, because it ____
a. innate; recognizes specific pathogens b. adaptive; recognizes specific pathogens c. nonspecific; targets all pathogens d. inflammatory response; is mediated by T cells e. skin; provides a physical barrier against pathogens
The middle layer of the wall of an artery or vein is made up of
A. valves. B. skeletal muscle. C. smooth muscle. D. endothelium. E. simple squamous epithelial cells.
Why are most cells small?
a. Because they don't produce enough energy to grow larger. b. Because the body has limited space. c. Because the surface-to-volume ratio must be adhered to for proper cell function. d. Because there aren't enough electrolytes to support large cells. e. Because large cells would not be able to undergo mitosis.
The most common eukaryotic ribosome carries out its function in the
A. mitochondria. B. cytosol. C. nucleus. D. Golgi apparatus. E. chloroplast.