Quantitative inhibitors
A) are produced in small quantities by a plant.
B) are toxic to herbivores.
C) reduce digestibility of plant material.
D) include cyanide and alkaloids.
C
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Enzymes _____
A) increase the rate of a reaction by making the reaction more exergonic B) increase the rate of a reaction by lowering the activation energy barrier C) increase the rate of a reaction by reducing the rate of reverse reactions D) change the equilibrium point of the reactions they catalyze E) make the rate of a reaction independent of substrate concentrations
The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
The elongation of stems is stimulated by
A. auxin only. B. gibberellin only. C. ethylene only. D. auxin and gibberellin. E. auxin and ethylene.
Centimeter-thin layers of earth that are rich in iridium give evidence to support the
A. allopatric theory. B. ecological isolation theory. C. gradualism theory. D. impact theory. E. punctuated equilibrium theory.