When two solutions that differ in solute concentration are placed on either side of a selectively permeable membrane, and osmosis is allowed to take place, the water will ________
A) exhibit a net movement to the side with lower water concentration
B) exhibit a net movement to the side with higher water concentration
C) exhibit a net movement to the side with lower solute concentration
D) exhibit an equal movement in both directions across the membrane
A
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Which one of the following statements about the human impact on Earth's ecology is correct?
A. Agriculture has increased abundance and distribution of some species, while decreasing abundance and distribution of other species. B. Humans commandeer as much as 25% of all photosynthetic production on land. C. More atmospheric nitrogen is converted to ammonia by humans than by the rest of nature. D. Human activities produce more carbon dioxide than do volcanoes. E. All of these statements about the human impact on Earth's ecology are correct.
The carrying capacity of white-tailed deer in a certain habitat is 10 deer/km2. The deer population is presently 5 deer/ km2. Which of the following predictions is most likely for this deer population?
a. A population decrease. b. A population increase. c. A population that will remain at 5 deer/ km2. d. A population that will reach 30 deer/ km2 and then experience a crash. e. A population that will be controlled by intrinsic regulating mechanisms.
The time it takes for half of a radioisotope’s atoms to
decay a. cannot be calculated. b. is used to construct the geologic time scale. c. is its half-life. d. is the same for uranium 238 and carbon 14. e. is all of these.
One way that substances move between blood and interstitial fluid is by
A) alternatively breaking and regenerating membranes of cells lining capillaries. B) osmosis. C) pressure-driven flow through clefts between the epithelial cells of the capillary wall. D) active transport utilizing ATP.