All of the following biochemical techniques have allowed us to understand cell structure and function except
A) light microscopy.
B) ultracentrifugation.
C) chromatography.
D) electrophoresis.
E) mass spectrometry.
A) light microscopy.
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Which of the following is true concerning the dodo bird?
a. The greatest effect by humans on the dodo bird was because Dutch sailors ate them b. The dodo bird went extinct in the twentieth century due to industrial pollution. c. Humans were not involved in their fate. d. Destruction of nests and habitat by animals that accompanied the sailors caused the greatest effect on dodo bird populations.
What is a necessary component of a powerful immune system?
A. immunological tolerance B. strict temperature homeostasis C. thousands of different Ig genes D. a large thymus gland
The type of photosynthesis that does not produce oxygen
A. occurs in algae and plants. B. occurs in purple and green sulfur bacteria. C. occurs in cyanobacteria. D. does not require sunlight. E. does not require CO2 as a reactant.
Which statement about coniferous forests is true?
A) Coniferous forests are the smallest terrestrial biome. B) Coniferous forests are characterized by long, mild winters and short, dry summers. C) Coniferous forests usually have nutrient-rich soils. D) Coniferous forests experience precipitation that is mainly in the form of snow.