Consider the global nitrogen cycle depicted in the figure above. What is the limiting portion of the cycle for plants?
A) industrial nitrogen fixation
B) nitrogen lost to the atmosphere
C) internal nitrogen cycling in the oceans
D) nitrogen fixation by bacteria
Answer: D
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Which of the following is a statement of the first law of thermodynamics?
A) Energy cannot be created or destroyed. B) The entropy of the universe is decreasing. C) The entropy of the universe is constant. D) Kinetic energy is stored energy that results from the specific arrangement of matter. E) Energy cannot be transferred or transformed.
____ describes the process by which molecules of a substance will move from regions of high concentration to regions of low concentration (until an equilibrium is reached)
Fill in the blank with the appropriate word.
A cell expends energy when moving substances against a gradient during ____
a. symport b. passive diffusion c. active transport d. facilitated diffusion e. antiport
An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes
A. Water to move out of the cell B. Water to move into the cell C. Solutes to move into the cell D. Solutes to move out of the cell