One of the most sustainable sources of biomass fuel is _______.
A. ethanol
B. biofuels refined from waste oils and fats
C. direct combustion of wood harvested from a tropical rainforest
D. direct combustion of coal
E. biofuels from conventionally grown soy
Answer: B. biofuels refined from waste oils and fats
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Which one of the following statements about endosymbiosis and the origin of the eukaryotic cell is FALSE?
A. Mitochondria are the descendants of purple bacteria. B. The chloroplasts of red and green algae are the descendants of cyanobacteria. C. Algae incorporated prokaryotic cells that became chloroplasts, but never acquired mitochondria. D. Many compartments of the eukaryotic cell are derived from the endomembrane system. E. Ultimately, both the chloroplast and the mitochondria of eukaryotes are descendants of prokaryotic cells.
When the chromosomes do not separate properly it is called ________
a. nondisjunction b. polyploidy c. monosomic d. trisomic e. aneuploidy
Many male songbirds are brightly colored. However, the color of the birds is usually determined by a balance of
A. sexual selection that reduces bright colors and natural selection in favor of bright colors. B. natural selection against bright colors due to predation and mutations that introduce bright colors. C. mutations that reduce bright colors and gene flow in favor of bright colors. D. natural selection against bright colors due to predation and sexual selection in favor of bright colors. E. mutations that reduce bright colors and sexual selection in favor of bright colors.
Which of the following represents a prezygotic barrier to reproduction?
a. hybrid sterility b. hybrid breakdown c. behavioral isolation d. hybrid inviability e. hybrid weakness