Which of Darwin's ideas had the strongest connection to his reading of Malthus's essay on human population growth?
A) descent with modification
B) variation among individuals in a population
C) struggle for existence
D) that the ancestors of the Galápagos finches had come from the South American mainland
C
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Being born with extra fingers on a hand is called polydactyly. This is more common in some populations in North America than others due to ____.
A. natural selection in favor of extra fingers in these populations B. random mating with other populations in North America C. an increase in mutation rate in these populations D. a founder effect because their ancestors from Europe carried the alleles E. migration of people with multiple fingers out of the population
Which of the following is not true about enzymes?
A) Enzymes are used up in a chemical reaction. B) Enzymes are made of proteins. C) Enzymes lower the activation energy of a reaction. D) Enzymes increase the probability a reaction. E) None of the above.
A marine biologist designs a study to measure net primary productivity in the world's oceans. She travels to the coastal zone of each continent, takes measurements from north, south, east, and west points along the continent, and combines her data into a
global average. Will these measurements be accurate? A) No, because ocean life is greatest near the poles and decreases toward the equator. B) Yes, but only if she is sure to sample different climatic zones carefully, because production in different climatic zones may vary by an order of magnitude. C) Yes, because although production in different climate zones differs, the open ocean is well mixed because of strong ocean circulation patterns. D) No, because ocean productivity is greatest past the intertidal zone. E) No, because the continental edges have much higher productivities than the open ocean.
Which of the following is the best definition of
sympatric speciation? a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. evolutionary change that creates two species occupying the same space