Which theory explains the origin of chloroplasts and mitochondria?
A. the theory of evolution
B. the theory of natural selection
C. the geologic time theory
D. the cell theory
E. the endosymbiont theory
Answer: E. the endosymbiont theory
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Examine the digestive system structures in the figure above. The highest rate of nutrient absorption occurs at location_____
A) 1 B) 2 C) 4 D) 5 E) 8
Recall Edward Jenner's experiment, where a boy was inoculated with cowpox and, as a result, did not contract smallpox even though he was exposed to the virus. Why didn't the boy get smallpox? Select all correct choices
A. because of an "immune memory" provided by plasma cells B. because of an "immune memory" provided by memory cells C. because of a primary immune response D. because of a secondary immune response
Deciduous trees are the dominant plant in which type of biome?
a. tropical forest b. temperate forest c. chaparral d. savanna
Which of these would be considered a transgenic organism?
a. a houseplant propagated from the cuttings of another houseplant b. a fern grown in cell culture from a single fern root cell c. a rat with rabbit hemoglobin genes d. a bacterium that has been treated with a compound that affects the expression of many of its genes e. a human treated with insulin produced by E. coli bacteria