Respiration is controlled by
a. chemoreceptors.
b. stretch receptors.
c. centers in the brain stem.
d. all of the above.
a
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Which of the following is incorrectly paired?
a. nucleus—coordinates cell function b. lysosomes—digest wastes c. mitochondria—produce proteins d. cytoskeleton—provides cell structure/shape
The difference between normal and sickle-cell hemoglobin is based upon the
a. number of amino acids in the molecule. b. substitution of one amino acid for another. c. number and orientation of the amino acid chains attached to the heme portion of the molecule. d. number of oxygen molecules that can be carried. e. type of bone marrow that produces it.
Which of the following is NOT a parasitic
roundworm infection of humans? a. trichinosis b. pinworm c. schistosomiasis d. hookworm e. elephantiasis
Which of these would most likely provide energy and support for a plant cell?
A. fatty acids B. inorganic compounds C. steroids D. carbohydrates