U.S. passenger pigeon populations are
a. healthy.
b. threatened.
c. endangered.
d. extinct.
D
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The biochemical profiles of the stomach contents of herbivores, omnivores, and carnivores are qualitatively and quantitatively different
a. True b. False
What feature of cardiac muscle helps the cells coordinate their contraction as a single unit?
A. large numbers of motor neurons B. covalent bonds between actin and myosin molecules C. intercalated disks rich in gap junctions D. fused cells with multiple nuclei
The 11 McFarland standards represent a specific degree of turbidity. What is the degree of turbidity used for?
A) To visually standardize the growth of bacterial cultures. B) To visually standardize the pH of bacterial cultures. C) To visually standardize the level of antimicrobic resistance. D) To visually standardize the growth factors available to the bacterial cultures.
The specimen for an electron microscope is always
A. sliced into thin sections B. viewed directly C. killed. D. stained with dyes.