After drinking a great deal of coffee (pH 5), a human's blood buffering system would need to ________ as the coffee was digested to lower the level of acid present in the blood stream.
a. release OH-
b. take up H+
c. release H+
d. take up OH-
e. release OH- and take up H+
Answer: b. take up H+
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A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?
A. The adhesion of water molecules to the needle B. The heat capacity of water C. The solubility of water D. The cohesion of water molecules to each other
Which of the following pressures is lower during inspiration than during expiration?
A) intra-alveolar pressure only B) transpulmonary pressure only C) intrapleural pressure only D) both intra-alveolar and transpulmonary pressures E) both intra-alveolar and intrapleural pressures
Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be _____
A) negative thigmotropism B) negative phototropism C) negative gravitropism D) the opposite of circadian rhythms
Sea otters have been used as an example of the "Keystone Species" concept. This means that sea otters
A. exert a strong influence on the structure and functioning of their ecosystem. B. are the base of the food chain in their ecosystem. C. are the dominant species in their ecosystem. D. have been recently introduced and are recruiting other new species to the ecosystem.