An early attempt by Cohn at bacterial classification grouped bacteria according to their
A. biochemistry.
B. Gram stain.
C. shape.
D. arrangement.
C
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Salts are removed from the oceans primarily by
a. absorption by living organisms. b. removal by sea spray. c. evaporation. d. adsorption onto particles.
The oldest "manufactured" tools have been found in:
a. North America b. Eurasia c. Africa d. Australia e. South America
Why do we have storage macromolecules, such as fats, in our bodies?
A. Macromolecules, such as fats, are a convenient way to store kinetic energy. B. We can break down these macromolecules to provide energy for the endergonic reactions in our bodies. C. Breaking down macromolecules, such as fats, is an endergonic process. D. Human cells can directly capture the energy of sunlight through photosynthesis and store it as macromolecules such as fats.
Vitamin D is added to milk because it increases
A) calcium absorption. B) the shelf life of milk. C) digestion of milk protein. D) iron absorption. E) digestion of lipids in milk.