Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the extant species were derived from the ancestor.
A. Tree 1 requires the most mutations, making it the best choice.
B. Tree 1 requires the fewest mutations, making it the best choice.
C. Tree 2 requires the most mutations, making it the best choice.
D. Tree 2 requires the fewest mutations, making it the best choice.
E. Both trees are equally good because sequences A, B, C, and D are the same in both.
D. Tree 2 requires the fewest mutations, making it the best choice.
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A filamentous organelle comprised of tubulins with a diameter of 25 nm is called
A. mycelia. B. microtubule. C. intermediate filament. D. microfilament.
Ecomorphs are ____
a. distantly related members of the same genus that are morphologically and ecologically diverse b. closely related members of the same genus that are morphologically similar and ecologically diverse c. members of the same species that live in very different habitats d. distantly related members of the same genus that are morphologically and ecologically similar e. closely related members of the same genus that are morphologically and ecologically similar
An examination of the arrangement of bones in the hand is an example of
a. an ecological study. b. a taxonomic study. c. an anatomical study. d. a physiological study. e. a homeostatic study.
Which statement best describes the mechanism of neutralization?
A) Antigens clump together and are more susceptible to phagocytosis. B) Cells are neutralized by toxins injected by natural killer cells. C) It causes pathogenic cells to lyse. D) An antibody blocks an antigen's activity by binding to it. E) Pathogens are bound by antibodies and are more susceptible to phagocytosis