Which two scientists evidenced evolution via natural selection as an idea whose time had come?
a. Darwin and Wallace
b. Darwin and Lamarck
c. Darwin and Malthus
d. Lamarck and Wallace
Answer: a. Darwin and Wallace
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With exponential growth, ____
a. r is always greater than zero b. growth occurs although r can be zero c. the number of new individuals added increases each generation, and r is stable and less than one d. the number of new individuals added increases each generation, and r is stable and greater than one e. the number of new individuals added increases each generation and r increases
Golden rice was developed to deal with problems of ____________ deficiency
A. vitamin D D. carbohydrate B. vitamin A E. niacin C. protein
Prokaryotes and eukaryotes are primarily distinguished by the absence or presence of internal membrane-enclosed organelles. Are prokaryotic cells at an evolutionary disadvantage because they lack organelles?
a. Yes; without organelles, prokaryotic cells cannot photosynthesize or respire. b. Yes; without organelles, prokaryotes are unable to bring together the reactants needed for biological reactions. c. No; although prokaryotic cells are comparatively less efficient than eukaryotic cells, they are still able to carry out the processes necessary for survival and reproduction. d. No; eukaryotic organelles are expelled each time the cell divides.
A red-shouldered hawk chases a falcon away from a dead squirrel. This is an example of:
A) coexistence. B) interspecific competition. C) commensalism. D) mutualism.