Which of the following is a good reason for using fast-growing trees as fuel?
A. Like fossil fuels, wood is nonrenewable.
B. Vigorously growing plants remove a lot of carbon dioxide from the air.
C. There are more trees than fossil fuels.
D. Wood has more sulfur than fossil fuels.
B. Vigorously growing plants remove a lot of carbon dioxide from the air.
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In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A. Their offspring are progressively weaker than the parents. B. They are more prone to disease than are horses and donkeys. C. They do not live as long as horses and donkeys. D. They are sterile.
Membrane proteins may function in
A) receiving extracellular signals. B) amphipathic modification. C) temperature control. D) protein manufacture. E) information storage.
A xenograft is graft tissue from a donor of one species transplanted to a recipient of another species.
Answer the following statement true (T) or false (F)
Which of these potential results of applying a metabolic poison to the rhizoids of Polytrichum should interfere the least with the ability to draw valid conclusions from this experiment?
A) If, upon dying, the rhizoids leak nitrogenous compounds into the soil before final nitrogen content is measured. B) If, upon dying, decomposition of the rhizoids introduces nitrogenous compounds to the soil before final nitrogen content is measured. C) If the metabolic poison is hydrogen cyanide (HCN) or sodium azide (NaN3), and much of the poison remains in the soil. D) If the metabolic poison acts against the mitochondria of the rhizoid cells. E) If the metabolic poison absorbs nitrogen and strongly adheres to soil particles, acting as a sort of glue.