A ____ is a pioneer organism.
A. shrub
B. lichen
C. tree
D. raccoon
B. lichen
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Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells. D. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually.
Comparisons of genetic information from various invertebrate groups has
a. confirmed nearly all classifications that were based on phenotypic resemblances. b. provided a complete and final picture of animal phylogeny. c. led to a decision to forgo formal classification of animals, as animal relationships are too complex to determine. d. led to a reworking of the classification of animals that is still being refined. e. confirmed that some invertebrates should be classified as vertebrates.
Erythema migrans, a bull's-eye rash, at the site of a tick bite is associated with ________.
A. ehrlichiosis B. plague C. Rocky Mountain spotted fever D. Lyme disease E. Q fever
Approximately 3.5 million years ago the Isthmus of Panama formed. This new landmass severed the connection between the Pacific Ocean and the Caribbean Sea. An ancestral fish population (porkfish) was split in two by this event; the two populations no longer interbreed and are two distinct species. This type of speciation is called
A. parapatric speciation. B. hybridization. C. sexual selection due to ecological variation. D. sympatric speciation. E. allopatric speciation.