Autotrophs gain energy from
A) the sun and inorganic nutrients.
B) secondary producers.
C) omnivores.
D) secondary consumers.
E) primary producers.
A
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The first host response to a nonspecific tissue injury is described as
A. inflammation. B. reaction. C. antibodies. D. trauma.
Changing environmental conditions would most likely cause an existing species to undergo ____
a. disruptive selection b. deleterious mutation c. directional selection d. stabilizing selection e. lethal mutation
Glucagon is produced by the
a. adrenal cortex. b. adrenal medulla. c. thyroid. d. kidneys. e. pancreas.
Cholesterol serves several essential functions in mammalian cells. Which of the following is not influenced by cholesterol?
(a) membrane permeability (b) membrane fluidity (c) membrane rigidity (d) membrane thickness