What characteristic gives C3 and C4 plants their names?
A) the sequence in which the carbon-containing molecules were discovered
B) the botanically assigned geographic coordinates where the plants are located
C) the first stable carbon compounds that are produced during the second portion of photosynthesis
D) the first carbon compounds that are produced during the light reactions of each type of plant
C
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What is the impulse that travels down a neuron's axon?
A) shock signal B) action potential C) currenter D) resistor
An example of homologous structures is the wing of a bat and the:a
arm of a human. b. wing of a beetle. c. tail of a whale. d. leg of a chimpanzee. e. dorsal fin of a shark
If a species is absent from a particular region, which are the reasonable explanations for its absence? Check all that apply.
A. It evolved elsewhere and never dispersed to the region in question. B. It was once found in the region in question, but was eradicated by humans. C. It was once found in the region in question, but became extinct there due to climactic changes. D. It was once found in the region in question, but migrated to other regions
IL-2, produced by TH cells,
A) activates macrophages. B) stimulates TH cell maturation. C) causes phagocytosis. D) activates antigen-presenting cells. E) activates TC cells to CTLs.