Binding of the activating nucleotide di- or triphosphate causes the Ras protein to (first)
a. separate into subunits.
b. split the terminal phosphate from the nucleotide-phosphate.
c. undergo a conformational change.
d. attach a farnesyl tail.
Ans: c. undergo a conformational change.
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The fluid which bathes and nourishes the tissue cells is the
A. cytoplasm. B. lymph. C. blood. D. interstitial fluid.
A loud sound can be distinguished from a soft whisper due to
a. more neurons depolarize. b. each receptor depolarizes more fully. c. the frequency of depolarizing neurons increases. d. variations in the signals each sound produces. e. more neurons depolarize, each receptor depolarizes more fully, and the frequency of depolarizing neurons increases.
The glucostatic theory was thought to account for ________, whereas the lipostatic theory was thought to account for ________.
(a) meal termination; meal initiation (b) long-term regulation; meal initiation and termination (c) meal initiation and termination; long-term regulation (d) meal initiation; meal termination
Why is an open circulatory system less efficient than a closed circulatory system?
A. Metabolic wastes cannot be removed from tissues in an open circulatory system. B. It is more difficult to quickly deliver O2 to specific tissues when needed with an open circulatory system. C. There is no heart to pump the blood in an open circulatory system. D. Open circulatory systems lack respiratory pigments that bind to oxygen. E. Blood cannot be used to transport nutrients in an open circulatory system.