The direct result of natural selection is a new species
Indicate whether the statement is true or false.
ANS: F, an adaptation
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Someone suffering from anorexia nervosa may experience which of the following physical symptoms? [Select all correct responses]
A. esophageal damage B. teeth erasion C. cessation of mensturation D. decreased thermoregulation E. both C & D
A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change
About twice a year, one or two more birds from the neighboring island arrive. These new arrivals _____. A) speed up the process of speciation B) tend to promote adaptation to the new food plants C) tend to retard adaptation to the new food plants D) represent a colonizing event
Microarrays are a powerful diagnostic tool because
A. a patient sample can be simultaneously tested for potentially thousands of suspected agents in the realm of the afflicting disease. B. analysis of the pathogen's genome can be performed and the gene sequences compared to suspected pathogens. C. ribosomal RNA can be isolated, sequenced, and analyzed with speed and accuracy. D. PCR can be performed rapidly and the DNA matched against known gene sequence.
The wings of a bird and the front legs of a dog are
a) vestigial structures b) homologous structures c) acquired characteristics d) analogous structures