What is evolution that occurs as a result of a dramatic reduction in population size?
A) founder effect
B) genetic drift
C) gene flow
D) population bottleneck
D
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A polypeptide chain is composed of:
a. amino acids b. proteins c. nucleic acids d. fatty acids e. monosaccharides
Compared to low tidal marshes, high tidal marshes are characterized by
A) lower salinity. B) decreased input of nutrients. C) higher tidal exchange rates. D) a phenotypically taller, greener cordgrass (Spartina).
Development of new vaccines has slowed in recent decades. This is due to
A) the ineffectiveness of vaccines against disease. B) the availability of vaccines against nearly all serious diseases. C) the high cost of development. D) the high level of risk with immunization. E) a lack of need with modern medical treatments.
A patient who presents with red throat and tonsils can be diagnosed as having
A) streptococcal pharyngitis. B) scarlet fever. C) diphtheria. D) the common cold. E) The answer cannot be determined based on the information provided.