Which of the following is true of zinc?
a. It binds to most proteins in the body.
b. Grains are the most reliable food sources of zinc.
c. Excess zinc can decrease copper absorption.
d. All of its functions involve it acting as a co-factor for enzymes.
Ans: c. Excess zinc can decrease copper absorption.
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Which statement below does NOT correctly describe paracrine regulation?
A. Paracrine regulatory molecules include cytokines and growth factors. B. Nitric oxide can function either as a neurotransmitter or a paracrine regulatory molecule. C. Endothelin and bradykinin are paracrine molecules that control blood vessel constriction and dilation. D. Paracrine molecules are released into the circulatory system to affect distant tissues. E. Platelet-derived growth factor and insulin-like growth factor are both paracrine regulatory molecules.
The area with the highest species diversity among the following is:
a. rocky subtidal. b. sandy subtidal. c. sandy intertidal. d. rocky supratidal. e. splash zone.
The function of synovial fluid is to:
a. store calcium b. reduce friction c. produce marrow d. carry nutrients e. resorb bone
Earth once consisted of a single large landmass and one ocean. The landmass is named
A. Panthalassa. B. Pangaea. C. Laurasia. D. Gondwana. E. Ultima Continenta.