There are currently many similar but different species on either side of the isthmus of Panama. They probably resulted from:
A) allopatric speciation. B) sympatric speciation.
C) hybridization. D) large rapid changes in their gene frequencies.
Answer: A
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Due to their similarities to fossilized glyptodonts, Darwin hypothesized that armadillos were ____ glyptodonts
a. the same species as b. unrelated to c. living descendants of d. coexisting in similar habitats e. genetically identical
Which technique is appropriate for studying protein-protein interactions?
a. nuclear magnetic resonance b. mass spectrometry c. protein microarrays d. x-ray crystallography
What is population variation?
a. variation between two adjacent populations b. variation that results from two populations mixing and interbreeding c. the distribution of phenotypes among individuals in a population d. a gradient of change from one edge of a population to the other
During synaptic transmission, the influx of ________ causes vesicles in the axon bulb to fuse with the cell membrane, releasing ________
A) mitochondrion; neurons B) Ca2+; neurotransmitter C) neurotransmitters; Ca2+ D) vesicles; neurons E) neurons; mitochondrion