The pituitary gland can be divided into __________ major functional areas.
one
four
two
three
Seven
two
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Which bones develop from pharyngeal arches?
A. The sphenoid and ethmoid B. Bones of the base of the cranium C. Most of the bones of the calvarium D. The facial bones E. The temporal and occipital
The enamel of the mammalian tooth is composed of crystals of
A) Calcium carbonate. B) Calcium fluoride. C) Calcium phosphate. D) Calcium chloride.
Which statement accurately describes isomers?
A. They have the same structural formula but different molecular formulas. B. They possess differing numbers of neutrons in their nuclei. C. They have the same molecular formula but different structural formulas. D. They have the same molecular shape but involve different elements. E. They have gained or lost electrons at their outer shell.
A myofibril is the
A. cell membrane of a muscle fiber. B. cytoplasm of muscle cells. C. structural and functional unit of the skeletal muscle cell. D. contractile thread that extends the length of the muscle fiber. E. protein strand composed of actin.