The pituitary gland is often called the "master of the endocrine system" because
A) it secretes eight different hormones that in turn regulate many of the other endocrine glands.
B) all other hormones must be activated by enzymes released by the pituitary gland.
C) it contains neuroendocrine cells that activate many of the other endocrine glands.
D) all blood vessels must pass through the pituitary so hormones can be regulated.
E) releasing and inhibiting factors for most other endocrine glands are released by the pituitary.
A
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Which of the following elements is considered an essential micronutrient for plants?
a. phosphorus b. silver c. molybdenum d. carbon e. lead
Tracers are elements that
a. are used in minute amounts in plants. b. can be monitored through biochemical reactions. c. must be inert. d. have an unbalanced electrical charge. e. must have a stable nucleus.
Multicellular organisms with hard exoskeletons, segmented bodies and four pairs of jointed legs in the adult stage are
A. algae. B. arachnids. C. insects. D. helminths. E. lice.
Which of the following certainly was not a source of molecules in the prebiotic soup?
a. meteorites c. prebiotic soup reactions b. comets d. DNA