Experiments in which nitrogen supplementation increased the biomass of both plants and herbivores show ____
a. bottom-up control
b. top-down control
c. indirect control
d. inverted cascades
e. nutrient cycling
ANSWER: a
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A reaction can be driven forward by:
A. coupling it to an ATP hydrolysis reaction. B. providing energy for the reaction in the form of intermediates containing acyl phosphate bonds. C. providing energy for the reaction in the form of intermediates containing thioester linkages. D. embedding unfavorable reactions in metabolic pathways containing reactions with large, negative ?Gs. E. All of these choices are correct.
Among important crop plants, nitrogen-fixing root nodules are most commonly an attribute of
a) wheat. b) cabbage and other members of the brassica family. c) legumes. d) corn. e) members of the potato family.
You are told that the song of males among a particular songbird species has an innate component but is also largely learned. Nestling males imprint on their father's song and then sing it themselves when they reach sexual maturity. Which observation
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A patient is brought to the emergency room in a comatose state. The family reports he had complained of nausea and a bad headache in the past couple of days. They also report they had engaged in their normal summer activities: picnicking, fishing and swimming at the lake near their home. His fever is high, and while in the ER, he has a seizure. Which of the following is likely to be responsible for his symptoms?
A. Entamoeba histolytica B. Giardia intestinalis C. Gonyaulax D. Naegleria fowleri E. Toxoplasma gondii