Primary and secondary xylem that can no longer transport water and solutes, but can store defensive compounds, is
called ____.
a. bark
b. heartwood
c. vascular cambium
d. sapwood
e. secondary epidermis
ANSWER: b
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The species of Moraxella that is most commonly associated with human infections, primarily of the respiratory tract, is:
a. M. catarrhalis. b. Moraxella lacunata. c. Moraxella canis. d. Moraxella atlantae.
Which of these is not a direct factor that controls biotic potential?
a. the age at which reproduction generally begins b. the resources available for each individual c. reproductive rate d. predators and pathogens e. genetic mutations
Pyrogens are
A. fever-inducing substances. B. fever-inhibiting substances. C. phagocytosis-enhancing substances. D. complement activators.
In humans, the thirst center is located in the ____.
A. adrenal cortex B. hypothalamus C. anterior pituitary D. pons E. thymus